Upgrading from the beta builds to the public release (when the beta completes) should work without issue as they'll be running the same code base. That being said, betas can introduce issues that will eventually be resolved in the final release, so we don't recommend upgrading production environments at this time. If you have a less critical environment with solid backups though that might be an excellent candidate for testing! Let us know if you have any more questions on this :-)
Kyle Kerst
Lead Internal Network/System Administrator
SmarterTools Inc.
smartertools.com