I'll have to plead guilty to not trying the beta, mainly 'cause I'm a cautious old-timer and try not to mess with upgrades till they're past the beta stage.
Something I might have missed in this topic, but didn't see mentioned -- are you holding off on database updates for the "regular" 4.1 home until you're happy with the new beta? Seems like an unusually long while since the last update -- less than a week, admittedly, but even that long is unusual for you guys.
Best,
Mike