Yeah, I've heard complaints about short support periods, weird bugs and games that just crash, but performance seems as good as Nvidia's from what I've read.

This seems to suggest that Nvidia's drivers are vastly superior on new OpenGL 4 features, though they do come from Nvidia: http://www.phoronix.com/scan.php?page=article&item=amd_apite... It's probably cherrypicking benchmarks a bit, but cherrypicking shouldn't have that dramatic results... Seems like I'll be sticking with Nvidia.