I’ve been using this model from quite sometime and before this I used a Z550i. Its just amazing when compared to the price and the features it has. To start with, Bluetooth, Infrared port, RSS feed, Flight mode, 2 MP camera, audio, video, etc... (I might take a long time here) and at a nominal price of Rs. 8, 650/- in a sony showroom. The camera is so handy that even if the keypad is locked, all you need to do is open the shutter behind and start capturing and with an auto focus, you need not worry about the picture clarity.
Another feature is it has flash, which can also be used as torch. The battery plays real cool. One important suggestion; allow the battery to drain completely before charging and again allow the battery to get completely charged before un-plugging the charger and you get to utilize it to the fullest.