I found this phone excellent except for the texting interface. It was extremely frustrating to get used to! I was used to the Nokia texting interface, so this came as a major culture shock. Its difficult to input numbers + unusual characters I found. Some good things are Voice recognition, vibration alerts, alarm clock and you can even record live phone calls and play them back (which was fairly amusing). Also its size is a major bonus, very cute!
But another weak point was the lack of ring-tones. It was very basic in that department. Also I found the over-all sound quality of calls lower than when using a Nokia phone before.
I expect I will keep this about 6-9 months before buying a new one when I get completely fed up with the poor sound quality and awkward texting interface :D
Summary : Good for size, alerts and voice recognition. Poor text interface and a question mark over the sound quality.