Persionaly i own an cheep FORCE3D hd 5670 and my dad has a ASUS hd 5670.
My Gpu is broken i get lags at all games and Gpu fan don`t work properly (allways on 28%)
My dads Gpu works fine no big lags,low temperature,good fps,...
Both are 1year old and so i dicided to buy an Asus,Gigabyte,Msi.
For XFX i don`t know if is it as good as it must be.
Sorry for bad english