Im using a w810i and its really awesome! The only problem i have with it is that it takes a bit time to load if u have a 2GB Mem and its full! Apart from that everything is awesome! Sound quality is awesome too! Comes with EDGE but not 3G. Infrared + Bluetooth (Obvious!). Radio with RDS. Best option which comes with in da SE W series is that when turning on the phone u can select whether to use the all the phone features or only turn on the walkman. When in the music only (Walkman) mode u can listen to music for a long time even in places where mobile phones are not allowed. I once listened to songs for about 35-40 mins with only 4% of the battery remaining!

Then they (Sony Ericsson) will stop designing new phones in the future 