Still no quarks yet. None of my movies and ringtones were erased from the internal SD during the process either. The only minor lag is with the Samsung Buddy widget (barely noticeable when scrolling to it). I don't use touchwiz anyway. Reinstalled ADW and Beautiful Widgets and everything is running perfectly smooth. The Mobile AP is awsome! 54 Mbps when I only have 2 bars signal strength. Browser with flash works great. I can go to MTV2.com and watch videos in browser! All the syncs have worked properly as well (FB and Google all I use). The stock video player plays more formats. Now plays movie files it didn't play in 2.1. Video quality is still better on Rock Player though with movies I've downloaded that are less than 720p. System seems faster and battery life seems better too. Task manager is nice addition as well. I'm cheezin'
No issue with lock screen or mms that I've seen mentioned on here.
My only gripe is there is still no ability to add signature in default messaging software.