I downloaded the new IDEA 7 release today, and pondered buying the upgrade licence, but went with the 30 day trial first. Here's a little video I made of an editing bug that I noticed immediately.
(If anybody can figure out how to get a .swf into a blogger page, please tell me how. Blogger just mangled any HTML I used to do it.)
Another niggle is that, including the milestone releases, the inspections that use @Nullable and @NotNull seem not to be present, and with no mention of why. Hopefully they're now just in some plugin that I don't happen to have installed. That's a bit of a show-stopper for me, I changed my coding style to use those annotations. I'd have to convert to FindBugs' equivalent to continue using that coding style.