I've bought two copies of Windows 7 (64bit for my PC and 32bit for my parents') the first copy I downloaded was shortly after W7 was released and the download was corrupt, but I received the disk a day after telling them about my problem. The second copy I bought worked perfectly (after I'd corrupted the download on my first attempt and redownloaded it).

So although I've had to use customer service a couple of times they've been excellent. Don't hesitate in getting your software and OS here!