I've had this phone for over 6 months now and I can say it's "ok". I did a lot of research on cellphones before buying my new one..always considered $, size and functionalities (alarm, bluetooth, etc). I paid $300 for this phone and thought I'd be getting a lot more than a $100 would offer. I was wrong. This cellphone is just a regular cute cellphone and is not worth $300 at all.
It has mp3, lots of colors and 512mb of internal memory, but you can find a lot of cellphones like that for less and very good brands. One thing I really hate about it is that I can barely set it up the way I want to! I can't customize a particular profile I like. For instance, I love this one profile that is pink and the menu looks great and fancy, but I hate it that everytime I press the arrow keys, it vibrates. I want to take it off! But I can't. It's kind of easy to use, you can find your way around what you're looking for easily I guess, but there isn't much "customizing" items in it. It's very annoying, so the operating system in my opinion, is the worst item in this cell.
The battery lasts a little less than my old Nokia, but I still think it's good.
I like the pinball game and the Sims game is kind of dumb.
Overall, it's a good phone for someone who uses the cellphone for talking only. If you really like the look of this cellphone, then go ahead and buy it, because it's not bad, it's just that in my opinion, it's not worth $300. If I could, I would get a new cellphone with GPS included for a little more, for instance. Or for like $100 more, a PDA.
OBS.: I've experienced some signal problems, where I have to restart the phone to be able to receive phone calls or even text messages again. It happens when it's been idle for a while, so I'm not sure whose problem is that. I contacted Sony in Brazil and they encouraged me to mail it to their services, but since I bought it in the US, I tried to contact them and they told me to go to their store and have someone test it, but it wasn't very helpful. They blamed my carrier, but my Nokia works fine with this carrier I have, so I thought this would be an important observation.