I am also using sony ericsson w550i from last two years. Truly telling you for any sony ericsson phone if its a simple one or its with high configuration, sony is always good as "music phones". Even if you will listen you the local radio station by this phone, you will enjoy the music. The music player inside it and the technology for sound is the best. Also for this particular phone, the screen clarity and the voice clarity are good.But my bad experience with this phone starts when I use it during rainy season.
One day I found the phone screen was suddenly blank. but still I could be able to accept the call and hear the voice.!!!!When I get it repaired, It cost me approx 1600 rs, the person change the screen, and the clarity now is really bad...!But still the music and sound has no effect. Its still as good as it was.Also the style and design of this phone is good.The OS used in this phone is also easy to use. If you have used NOKIA phone and then you are using sony ericsson, you will need some time to be familiar with it.But the worst thing is If you are using the earphones, the top part of it which is smooth can easily be removed. And if you have put this earphones in your bag, sometimes you will lose this smooth part.
And if you want to but it again it costs rs. 50 Per piece. But still you have to be careful for all these things..if you want to take the advantage of this phone. I would like to say its not bad to buy this phone.