The Good:BT Pairing - Pairs easily with the Treo 650.Good sound output - Good volume for a Bluetooth set, will not top wired though.Good sound pickup - Folks can understand what is said in a moving car, but again not as good as wired.Useable in light/medium wind - Not wonderful, but workableComfortable - Comfortable but heaver than some. Note the ear loop can be made larger with some steady strong bending, no where is that noted in the manual. Go slow, once bent it seems to want to stay that way.The Not So Good:Light is under button - So you can't see the signal flashes when pushing button unless you push with your finger half-off the button.No instant mute - You can't pop off mute, answer a question, then pop back on. It takes a few seconds to activate mute.Custom Power Plug - You can't power it with a USB cable like some headsets. (i.e. Moto)Looks - To each his/her own, but not as good looking as many headsets IMHO.Overall:After several tries the Mobile Freedom is the first useable Bluetooth headset I have found. It workes well with my GSM Treo 650 which many headsets have problems with. And, above all, you can hear and callers can hear you. Overall a good workable Bluetooth headset.