I downgraded from the 220.127.116.11 TIM release back to this one on my T-Mo unit, it's looking pretty solid - nothing different than .71 is popping out at me right away.
A trimmed backup of the data from 18.104.22.168 (i.e. just address book/bookmarks/messages/etc., no RMS databases or other junk) restored without any problems into this OS release, so my downgrade was painless.
I am, however, reinstalling all the OTA apps (GMail, PicoNews, etc.) from scratch as you'd expect. I wanted to start clean and fresh...