Downloaded and installed last night. Oh, looks like I need to download App World again. Everything seems to be working just fine otherwise and I've got 123MB of free memory, which is pretty good.
I have used .545, .566 and now .586 in the past two weeks and they all seem pretty much the same. I didn't encounter any of the other reported issues because I don't use my BB that way or use those apps but I'm glad to hear some of the .566 issues were fixed.
It was funny, in .566 if I highlighted the SMS/MMS icon (which is always on the home screen for me) it would show all recent messages, read or not. Actually kind of annoying. Now it's gone. Thumbs up, I think.
I will probably give it a full charge tonight and then test battery life over the next couple days.
This is so much better than running the 5.0 betas on the 9000 ... no browser fixes, apps all pretty much work, fairly smooth by comparison. :D