Pros: Perfect for my use: desktop access for four working usb3.0 connections for multiple drives, even hard drive enclosures.
Works great with Linux!
Multiple drives? No, problem.
Multiple high power drives? Slick and easy.
Fast transfer? The fastest I've seen outside of e-sata.
Far better than crawling under the desk to insert and remove the drive from the computer.

Cons: With three versions of Windows, none work with this model. It turns out that USB3.0 requires a specialized i/o stack and interface that is not available on windows 8, 7, nor Vista (haven't even tried XP).
Oh, and there are no drivers available on the iogear website. Additionally, after leaving a message on their "Contact Us", it has been more than a month with no answer.

Other Thoughts: I really can't blame iogear for the failure of MS to manage a good operating system. Really, I can't.
However, I can shake my finger over the lack of a driver. I am also upset about the lack of a response on the Iogear website. This last makes me quite upset.
Get your act together Iogear!

Fedora 20 (among other distros) takes this product and runs all over the competition. I am completely surprised, and very heartened, at the fact that Linux supports something out-of-the-box before MS Windows.

However, as a product I have to ask:
Really?

Manufacturer Response:

Thank you for choosing IOGEAR and we apologize for your experience. The GUH374 is completely plug & play, and requires no drivers or other special installation for computers factory-equipped with USB 3.0. The problem you described is indicative of missing, damaged or out-of-date USB 3.0 host controller drivers. If your computer came with USB 3.0 from the factory, then update your USB 3.0 host controller drivers from you PC manufacturer. If you added USB 3.0 support via a controller card, then you must use the card manufacturer’s drivers. Hopefully this will solve your issue. To better service you and understand your set up, please feel to contact our customer support at 1-866-946-4327 or email us: support@iogear.com. Once again, thank you for choosing IOGEAR.

Pros: 4 Port USB hub

Cons: Poor design, had issues from day 1 set it aside, after finishing my office, I decided to set it up on the desk just to have more issues. noticed the usb3 slot that connects to the computer was very flimsy as if it was loose. Upon adjusting the usb3 cable a little it would aquire connection then lose it again. Opened the device to see if it was something I could fix myself but the entire usb3 slot was lose from the board. Threw it out.

Other Thoughts: Not going to buy another. Maybe if you buy one and it gives you issues, RMA newegg immediatly and buy another brand.

Manufacturer Response:

First, thank you for choosing IOGEAR and we apologize for your experience. The product should not behave as you described. Since the unit is backed by IOGEAR's 3 year warranty feel free to contact our customer support at 1-866-946-4327 or email us: support@iogear.com. Again, thank you for choosing IOGEAR.

Pros: Would like to like it... if it worked as an actual hub

Cons: Only gave me one USB port....

Other Thoughts: Using 3 USB hard drives with the hub powered it would only show one drive, the first one plugged in. All three drives and their cables work fine when plugged directly into the computer or individually into the hub, but if anymore than 1 drive is plugged in at a time only the first is shown.

Manufacturer Response:

Thank you for choosing IOGEAR and we apologize for the inconvenience. To better service you and understand your set up, please feel to contact our customer support at 1-866-946-4327 or email us: support@iogear.com. I will pass your suggestion to the product manager for his review. Once again, thank you for choosing IOGEAR.