I have upgraded to ubuntu 11.10 oneiric ocelot yesterday from 11.04 hear are my thoughts on it.
- The interface has been polished and the Unity interface is usable now
- I like the new login screen with its smooth animation. But some how when you lock the machine the old interface is visible
- The lock screen animation is much smoother now
- The icons that have been used look much nicer and cleaner
- search inside unity works and their no lag between pressing the windows key and the unity menu opening up
- The new Empathy and Gwibber looks really nice
- The new software center is really nice and easy to find applications