No way, .66 lags fairly often, the unread message icon shows up all the time for no reason when there are no unread messages (ive literally stared at the screen and seen it come on for absolutely no reason.), and the phone just generally freezes up for 2-5 seconds all the time just when trying to move the cursor through the icons or menus...it's ridiculous. IMO that newest beta is still far from perfect and releasable...it's disappointing.