I purchased an ATI TV Wonder HD 650 Combo USB TV Tuner on April 21, 2009, but had to return it the next day. The manufacturer is Diamond.
I installed the software, but the ATI unified AVStream driver was either not present or not working. I tested this on both Windows XP Professional and Windows Vista Basic, but it did not work. The USB TV tuner was not detectable.
Under hardware manager, there is an exclamation mark beside ATI unified AVStream driver. Uninstalling and reinstalling did nothing. Furthermore, there is no way to download the driver from the Internet. I spent a few hours searching for a driver, but came out empty handed.
I will have to try another and see if I have better luck.
This one works great, but is more expensive.