Using 12.04 here, all the core functionality is rock-solid, so this is not urgent.
I just wondered if it is easy to change the size or font of things like the title bar - and especially in the file manager list view. While I was using MS Windows, I had the font sizes bumped up. The Ubuntu defaults are a bit small for me - eyes not so great any more.
I could not find it in System, Settings.
Increasing the font size in terminal was a doddle though. Green on black too!