No issues here. I was one of radeon 7970 testers and can confirm all the best about it. I replaced gtx 580 where I had with an script (rotating cube 831x800x800 subdivs in full screen shaded) approx 17fps and after like 30 esec of rotation goin gup to 80fps, and right after I replaced it with radeon 7970 fps jumped to 170fps, no lag at all. Huge improovement over nvidia, plus support for 4 monitors does come handy as well (running all 4 of them without problems) I can only highly recommend ati over any nvidia card now. gtx cards seems crippled completely gfor SI, and quadros are waaay more expensive and still I got better results then some quadro cards when we run some tests here on list couple months ago.
good luck :)
