Just tried out 10 for the first time, and on Linux it is useable (unlike 8 and 9 which were just too slow).
I think the UI even seems more responsive than 7, and I have set up my idea.vmoptions nicely for Swing and GC too.
I take issue with the popup placement for parameter info, which obscures the caret just where you are about to type, but this has already been reported as an issue.
Well done, I'm upgrading from 7 at last. Like it!