I eventually upgraded to 12.04 and found 4 things "out the box" which I don't like (from 11.10)
Launcher : No longer appears on the desktop and disappears once something open. Now either always hidden or always visible - prefer the old way
Right-click colour scheme : When you right-click I always liked the white text on black background interface. Now it is reversed to the windows way
Keyboard: My fault for not selecting right config., but it was very easy for me to select the wrong one, then no @ key etc.
1 day after downloading 12.04, update manager tells me I need to download 118 mb ?
It does seem faster though (not to boot up, but to load and use programs).
I know that these are small things but I was hoping to settle down with the LTS version for a while, not so sure at the moment though.