I bought it specially for bluetooth functionality as I use mobile connectivity frequently.
Really it is cheapest in market which offers bluetooth but the disappointing fact is that its cam is not so worthy. Though I knew it in the starting because even its not a VGA camera, but if you transfer the picture from cell to computer then it looks very blurred. It would have been better if in place of cam, FM radio would have been there. Sound quality is good. Also comes the questions how useful is the shared 2 MB memory. In my view its enough for storing 30 -40 pics and few ringtones.
What makes sony fones a bad storage device is unavailabilty of memory card slot.
They support only memory stics(as far I know) which are very costly. So if it should contain more memory then it could be used as data device also, which is very useful these days. Looks are good, much look likes K750.