hi,
i've got vf900cu and i must say that i'm more than happy. i didn't actually see any test between them, but as far as i saw at the shop when i compared them i thought that vf900 is a bit more "massive", and nicer
so i bought it...result: my oc-ed radeon 725/800 -> 900/1030 @ 40°C full load...rams are a bit warm...