I’ve just upgraded to Lucid Lynx. Pretty slick!
The upgrade worked out quite well and I was really surprised. My system usually runs a lot of beta/alpha softwares. One way to avoid any problem is to do a clean install. If you have all your data in your home and you have partitioned in a convenient way you can do it in a light heart way.
Unless you had to install tons of scientific softwares in /usr/local for some kind of reason.
It took me one day to get everything up to date, from to add the new slick indicator applet to the panel, to check out the new stuff. (I gave a go to GNOME shell, but didn’t really get into it too much yet!)
If you just installed Lynx and don’t know what to do, check out this post.