I've had this product now for a few weeks; it seems to have gone up in price though as I only paid £47.75 which was cheaper than the 54g Microsoft wireless adaptor at the time.
So far I've had no problems, I'm only using this on a G band network but it seems fine, I've never lost connection and it doesn't interfere with any of my other devices so all is good.
Setup was a piece of cake, it's advisable that you use the included disc and for anyone concerned it does work on Windows 7.
My only criticism would be that it does require its own source of power rather than the Xbox alternatives that run off usb, the size although not huge again is bigger than the Xbox adaptor's and finally this device only has one aerial, now I don't know if this is an issue but all the other wireless N adaptor's I've seen have two.
I would certainly recommend this product because you have to remember this is essentially just a Wi-Fi extender so although it's been designed to look like the Xbox it is compatible with any device that has an Ethernet port.