Well, I do use the non-proprietary drivers supplied with Xorg for my Radeon 7000, am using OpenGL on two vga monitors and I'm absolutely happy with it - no freezes at all (Debian Sarge). Only issue is, the client seems to leak memory, and if it doesn't crash for a while, my X gets a bit slow (only 512 M RAM)

Cheers,
- Finira -