My 2 daughters and myself have this phone. We used to have a Nokia N73 and normally use Nokia. So far we have been impressed with the Sony phone. We have not had any problems with it so far at all. Unlike the N73 which used to freeze all the time.
The only thing that I would say was a bad point is the lack of flash for the camera. But it think the features and the reliability is easy to overcome the lack of flash.