Bought this for my Xbox which lives upstairs in my room, with the router downstairs. Was a little worried i wouldnt get a great signal through the floor/ceiling. But, its actually pretty strong (3 bars out of 4). Very happy. Easy to set up too. I already had the updated dashboard (and so the necessary drivers) but turned the xbox off, attached the wireless adapter USB into the back of the xbox, i didn't know before but the adapter clips in to the back of the xbox casing also so its not flapping about and keeps things tidy, put the disc in anyway, turned the xbox on, went to system settings and wireless connection, the adaptor scanned the surrounding area for routers and found 4 or 5 (the others being the neighbours i imagine, two of which were 1 bar, so just goes to show how well the adaptor performs, being able to get a solid bar from routers in other detached houses 20-30m away!), found my router (as i said 3 out of 4 bars) put the router access password in, and it connected. 5 minutes max. Easy.
No problems, good signal, yeah a little pricey, but if you want a solid wireless adaptor this is it.