Summary: I'm not a gamer, but I do have a few (3; AOE III, GTA Vice City and GTA San Andreas) games I do like to play, and my Dell 755 built-in graphics wouldn't let me play any of them beyond 800x600x16. Worse than that, the PCIe-16 slot was only rated for 25W, and the power supply didn't have an additional connector for a video card, so I was stuck with what the slot would put out (or do an expensive power-supply swap).
Summary: This is a nice little card, especially for its price. It's not a high-end one, but it is good for movies, light gaming, and YouTube. If you're looking for a good card for an everyday computer this one should fit the bill.
Summary: Bought this for my Win 7 machine, based on the reviews here, after buying a new HDMI monitor. Tried the drivers on the DVD, got a BSOD during install of drivers/Catalyst. Unfazed, I went to the website and downloaded the latest. Same thing, BSOD on install. Shippin' it back. Off to get an NVIDIA.