This is a superb phone. The battery life, voice quality, and ease of use is exceptional.
I’ve had the phone since it was launched in India, and therefore have used it for almost 2 years.
Battery life: 3 to 4 days. I charge it only when the indicator turns red. Compared to other phones (which tell lies about the charge remaining), this phone is very truthful. When it turns red, you have around 30 minutes of talk time remaining. My other phones - Motorola, Alcatel, Nokia - were all very optimistic about their prospects, and would die in the middle of a conversation.
Software: while the Sony Ericsson software provided with the phone is very good - if you use it properly, you can avoid buying a PDA - you have to get FMA (Float’s Mobile Agent). This is free, open source software which lets you do amazing things with your phone. For example, if you have Bluetooth, you can use FMA to control Powerpoint presentations using the joystick on this phone. Try that with your Nokia!
Voice quality: I regularly have longconference calls with people around the world, and I’ve never had a problem being understood. Given that this is also a function of the network (Airtel, in my case), I used to struggle with Alcatel/Nokia/Motorola etc.
Bluetooth: has worked with every device I’ve thrown at this phone ... PDAs, laptops, other phones, headsets ...
The user interface is pretty good ... the only quibble I have is over the search function. This could be smoother.
Now that the price is less than 7k, it’s a steal.