Pros: I bought this so that I could add a second network card to the small computer I have running PFSense (home-built router, basically). I expected to have to do a lot of configuring and driver installing. Instead I plugged it in, turned on the router, and PFSense detected and installed it immediatel...
Cons: It's still a USB network card, so latency and whatnot isn't top notch. Still, I just needed a functional and reliable network card, and this does the job.
Summary: It's not the cheapest Ethernet adapter out there, but it works and it seems to work great for most cases. If you're planning on moving big files or streaming uncompressed HD video to your Xbox and you have USB 3.0 you should spring for the gigabit version. But this is fast enough for most cases.
Pros: This works great! Plugged into my MacBook Retina and in seconds I had an internet connection with my wireless disabled. No drivers no CDs, not setup. Speeds are just fine, I probably should have spent a little extra for the 3.0 gigabit version but I really just needed it so that I could have a ha...
Summary: For a simple extra network interface you could do worse, especially for the price. Not sure about how it would work in linux though, so one egg off for that.
Pros: Works fine in windows, and OS X 10.6. I tried it on a couple linux machines but didn't have any luck, but I didn't want to spend a ton of time on it either, so YMMV. Good speeds for USB and seems reliable. It's good for an extra interface when you don't need high speed transfers.
Cons: Limited by USB 2.0 speeds, so if you need a high speed network connection this is not what you want.