I've been using Phoenix/Firebird/Firefox since 0.1. Even then it was a great browser. I installed 0.9 (and 0.9.1) the day it came out. I don't need 0.9.2, as I don't run Windows. I haven't noticed any major rendering bugs in a very long time, but then again I haven't used Internet Explorer in a long time either (almost 12 months?), so I don't know what these sites are supposed to look like, either.
I don't run adblock, but I do run flashblock. It can't be installed in 0.9 yet apparently, but I had it installed before I upgraded (surprisingly still worked after the upgrade!). It replaces flash content with placeholders that are the exact same size as the flash animation was, so there's no misrendering. I don't mind the banner ads (I totally ignore them anyway), so I don't bother blocking them.