Just ran some benches -
Heaven bench is about what I expected with no tessellation and running in OGL, pretty decent performance.
The Cinebench benches are running through Wine, again, not far from what I expected. I've also heard this isn't a totally reliable benchmark.
File transfer speeds are through the roof though, loving that, but my router is also giving me grief, so anything else requiring that will have to wait a bit.
Also, I've had this running and been using it quite a few hours since I installed it, and have had just one app crash on me. F-spot, which I'm not overly worried about.
All in all, still very happy with this OS.