I got one in my PC and I'm more than happy with it. I got it last April when it was third best performing card in ATI's HD5000 product line.
I needed a powerful GPU for openCL programming(it can do over 1 TeraFLOPS) and found that it was the best value for money at that time.
I can't talk much about gaming, as I don't play games, but it got really good reviews back when released. I did instal some technology demos and was really impressed with its speed. You might want to check Tom's hardware GPU charts and a couple of other PC sites for reviews (it was released around October 2009). In general they had nothing but praise for it.
Remember that the PC graphics card market moves fast, and quite a few other cards came out, so it's not cutting edge technology anymore, though as alexh pointed out, £60 for one is a pretty awesome price if you ask me.
Edwin
