I upgraded early to Ubuntu 9.10 release and have been overall very satisfied with the changes. 3d effects are back, thanks to fixed intel drivers, kernel has been upgraded and suspend + boot is faster, and Emacs has been upgraded to 23 🙂 I just had one problem when upgrading, namely that QT applications would use a non-hinted font which made Skype and Virtualbox would look like crap. It took a bit of googling to find out what the problem was. Using qtconfig-qt4 did not work for some unknown reason. I followed the guide on the link, and got fonts working again by simply copy/paste in his .fonts.conf file into my home directory.