I've had fundamental issues with the last few of Ubuntu releases that I've seen come out of Canonical. Jumping from Jaunty to Karmic was foolish -- not all of the bugs had settled out of it for at least a month after its release. Lucid moved the default location of the window buttons -- it is unwise to muck around with a geek's muscle memory. Maverick doesn't seem quite as stable overall, although I've run into fewer problems with jumping from Lucid than Karmic gave me. It is also completely nonsensical and wrongheaded to change introduce a mode to the Close button for Rhythmbox -- it effectively minimizes to the tray if the close button is pressed while it's playing, but closes the program if it isn't. Stupid, stupid, STUPID.
I've been looking for a new distro as a result. Judging from the GNOME vs Canonical news of late, I must not be entirely without justification to be less than satisfied. I've tried Unity. Didn't like it. I've really wanted to go with a Debian based system, if at all possible, because I know the basics of apt well and I like its speed. I wasn't enthused by OpenSUSE's dog-slow first impressions. I've also experimented with CentOS, but I like something a little more up-to-date, so I'm giving Fedora 14 a go. The last time I did anything significant with it was 11(!) versions ago. Still learning, but so far, the experience has been pretty pleasant. I've always liked Red Hat as a company even if I wasn't necessarily wild about RHEL or Fedora. I may be changing my mind about that one. We'll see. Here's to hoping. :-)