Tried to install Feisty recently. Turned out to work fine (the proxy business at install now works). But there were still problems. The mouse configuration (I use a logitech marble mouse) was a pain. Logitech make nice equipment but their devices never work properly with anything else and are hell to configure. Combine this with Xorgs bizarre configuration scripts (while they have sadly not thrown away since the fork).
I find it incredible that no one has written a nice mouse configurator, and more incredible that you have to restart X to see what the effects are. This really needs to be sorted.