i tried the beta, didnt have any issues at all in the short time i tried it, and i like the new look its much more cleaner and professional looking, but i wont be installing when it comes out, will just wait for linuxmint 9 which is based on ubuntu but is so much better imo, much more polished and everything works!
10.04 looks quite nice though, i'll no doubt install it and see how i get on! 