Working well on my TMO 8320...
Still waiting for a 4.5 Curve OS that fixes the bug with BBAlerts. Incoming PIN messages are flagged and alerted as emails within the program. Never happened on 4.2 and from what I understand this is a RIM bug and not a BBAlerts issue.
I'd love to see this fixed in a future 4.5 release.
T-Mobile - 8320 - BIS