I had used Ubuntu since Gusty Gibbon 7.10, Then I upgrade to Hardy Heron 8.04. Today I Upgrade Hardy to Jaunty Jackalope.
But I have Karmic on my Lap-top. I personally prefer Jaunty because is fast than Karmic or Hardy.
But in the version Netbook Remix (which I use in my lap-top) Jaunty has a lot of bugs so I upgraded it to Karmic.
I hope that the new distro Lucid Lynx 10.04 LTS will be better because it will be a Long Team Support.
Anyway “Live Jaunty”