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Square D Econoflex VFD 25 HP 460V Class 8839 58ELG4VW Altivar FLEX58KD23N4 Drive30 Day Functional Warranty Shop with confidence! We guarantee all equipment to be fully functional. Your purchase is backed by our 30 Day Warranty, which begins upon confirmed delivery. If the item does not function as described, we will, at our discretion, repair the item, offer a replacement, or issue a refund upon the secure return of the equipment. Shipping & Freight Logistics Freight Handling: Average handling lead time is 5 business days (varies
30-Day Functional Warranty Shop with confidence! We guarantee all equipment to be fully functional. Your purchase is backed by our 30-Day Warranty, which begins upon confirmed delivery. If the item does not function as described, we will, at our discretion, repair the item, offer a replacement, or issue a refund upon the secure return of the equipment. Shipping & Freight Logistics Freight Handling: Average handling lead time is 5 business days (varies by item size, carrier used, and shipping location). Freight Inspection (Crucial): For all freight deliveries, the buyer must inspect the shipment for transit damage and NOTATE ANY DAMAGE on the bill of lading. Have the driver initial the bill of lading and take a photo of entire bill of lading. Send the photo of the BOL to your contact at Quantum Technology. Any damage not noted on the bill of lading will not be refunded. Local Pickup: Available for many items. Please note: Palletizing, strapping, or loading assistance is not included with local pickup unless arranged in advance. International Shipping: We ship worldwide either directly or through a freight forwarder! Contact us for a custom freight quote if international checkout is unavailable. Listing Terms & Exclusions What’s Included: Only the specific items, cables, and accessories shown in the listing photos are included. If it is not pictured or explicitly listed, it is not included. Cosmetic Condition: This is used commercial equipment. Expect minor cosmetic surface scratches, scuffs, or blemishes that do not impact mechanical or electrical performance. Regulatory & Safety Removals: * Generators/Engines will be shipped without batteries and fuel per DOT safety regulations, therefore those items must be purchased separately by buyer. NOTE: there may be some fuel remaining in the tank as allowed by DOT. Servers/Datacenter Gear: Do not include hard drives, software licenses, or operating systems unless explicitly stated. Buyer Responsibility & Liability Limitations Compatibility: While we guarantee functionality, listing descriptions are for reference only. Buyers are solely responsible for verifying technical compatibility, power requirements, and software integration with an expert prior to purchase. Limitation of Liability: Quantum is not liable for liquidated damages due to shipping delays or equipment failure. Quantum’s standard warranty applies as shown above. Except for the 30-day warranty stated above, all items are sold "As-Is, Where-Is.”Shipping Notes
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4.0 ★★★★★
Based on 15 reviews
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Product Reviews
★★★★★ 1
A rushed, poorly written guide of how the "experts" can't really explain what Deep Learning is
Format: Hardcover
This book, in every sense of the word, is rushed. I think the authors wanted to establish themselves as leaders of this young-ish field, but does so by sacrificing quality. It also shows that Deep Learning theory has been there for a long time, known by another name called Neural Networks. The interesting algorithms are of MLP, Back Propagation and the classical neural networks. The optimization methods such as Adam are the ones that are new and interesting, and the only ones worthy of in this book. So, essentially, what you get from this book is use A for X, B for Y and C for Z type of dry, un-intuitive, badly written waste of paper.
As for the structure of the book, it's like an example of how not to structure a book. It has some linear algebra, probability at the start (not good enough, and confuses more people and wastes paper). Goes on to prove other algorithms such as PCA (yeah, ok!). Then, talks about how this architecture works for this and that architecture.
So, yeah, if you really want to try out deep learning, don't buy this book. Set up Tensorflow/pytorch/ other library, run the tutorials, find an architecture for the problem you are interested in and start tweaking that. You will have far more fun and would have saved your money.
The praise that this book gets is beyond me. Did Musk even read this book? I doubt it.
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Reviewed in the United States on May 15, 2018
★★★★★ 5
The classic textbook on Deep Learning
Format: Hardcover
Deep Learning is the promising direction towards general purpose effective artificial intelligence.
There is an explosion of fruitful research in recent years and a lot of applications pursued mainly from technology giants as Google, Amazon, etc. and outstanding research institutions.
The book "Deep Learning " by Ian Goodfellow, Yoshua Bengio, Aaron Gourville, is an excellent piece of work.
They manage to present rather difficult things in an understandable manner. The theoretical presentation is outstanding typical of "classic" books. Also, the book stays close to the practical applicability of all the methods and discusses applications extensively.
There are a lot of other useful books on deep learning that follow a more practical approach by focusing on a particular deep learning software package, but this one book is certainly much more essential since it provides the required theoretical background in order to be able to do serious work on deep learning.
I consider the book as "must have" for anyone that works on deep learning either in an academic or in an industrial environment.
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Reviewed in the United States on August 25, 2018
★★★★★ 5
100% Recommend
Format: Paperback
Invincible Compendium One completely lived up to the hype. From the very first chapter, I was hooked by the story, the action, and the character development. What starts off feeling like a classic superhero story quickly becomes something much deeper, darker, and way more emotional than expected.
The artwork is incredible and the fight scenes are intense without feeling repetitive. Every character feels important and layered, especially Mark and Omni-Man. The pacing is excellent for such a massive collection, and it’s hard to put down once you start reading.
If you’re a fan of superhero comics but want something with real stakes, shocking twists, and strong storytelling, this is absolutely worth reading. Easily one of the best graphic novels I’ve picked up in a long time.
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Reviewed in the United States on May 23, 2026
★★★★★ 5
This is the best purchase I’ve made in 2025!
Format: Paperback, Format: Paperback
I don’t even know where to start ever since I finished (in early August, 2025) the whole series of this comic. I have never been this much speechless in my life. It’s my first comic that I’ve ever read and finished it.
I got into invincible through the TV show and I wanted to give a shot on comics because people said it’s even better than the show, and I was blown away just by the tv show until I started reading this.
It didn’t matter how tired I would be and/or how busy I would be, but I’d still make time to grab and read at least some pages very excited.
There are so many parts in this comics where it reflected on my personal life and somewhat opened my eyes of what I had and need to do in my life. It was really fun, exciting, loving, caring, sad and emotional story. This comic has a definitive beginning and a final, conclusive ending.
I loved it overall despite where there were some boring parts, but it all made sense later in the main story. Very well developed characters, stories and art.
Now whenever I pass by my bookshelf and I see these books puts big fat huge smile on my face. I’m glad I have it in my collection. I got to experience in this comic what I couldn’t in real life.
Every other night in random or toughest moment I would think about what would mark do in this situation.
Thank you for this masterpiece ❤️
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Reviewed in the United States on September 18, 2025
★★★★★ 5
Amazing story, just don’t buy from amazon
Format: Paperback
Don’t buy these from Amazon. The book is obviously great, but Amazon likes to just throw these into bubble mailers (or even just brown paper bags) and then send them off. No shrink wrap, no padding. Just a big book rattling around loosely in a bag. It will come dented and dinged 100% of the time. Just buy from a comic book shop or eBay seller who actually cares enough to package properly. The content of the book itself is fantastic though. I love this story so far and can’t believe I took so long to get into it. It has such a classic superhero feel while also subverting the genre in so many cool ways. Robert Kirkman can’t miss!
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Reviewed in the United States on April 25, 2026