I have a 8320 Curve / ORANGE till one year and still very happy of all functions and possibility of this great smartphone.
I explain the "little" problem I have: I have a full Orange solution for business with pushed Emails. When moving from EDGE (outside) to WiFi (Home), no problem, I still receive my Emails. At home, UMA for voice and Emails, everythings fine (Except Opera Mini sometimes little crappy !)
But when moving back from WiFi to EDGE, I always lost my Email connection and I have to trig a "manual reconciliation" to be able to receive my Emails again. I have last firmware on 8320.