I have a Treo 650 and so far I love it. The Bluetooth capabilites are awesome...no need for wires to sync it to my computer (although you will need a Bluetooth adaptor) and it will work with certain cars and wireless accesories that are Bluetooth capable. As for the performance it is great. The phone is the phone but you can surf the Net at speeds up to 56K, which on a phone is pretty good. It is not WiFi capable but sending and receiving email is fine as is surfing the Internet if there are not a lot of pictures. The color screen is awesome too with the resolution very, very good. Not to mention I have all my contacts and calandar entries in one place and do not need to lug a phone and PDA with me.