I replaced a Jabra BT200 with this headset and there are some pros and cons in comparison.PROS vs Jabra-Lighter.-Easier to put on ear.-Can wear much longer without ear fatigue since it's not in-ear designed. Couldn't endure the Jabra for more than a couple of hours.-MUCH longer battery life. I've gone days without recharging, the Jabra required daily charging.-The form factor is much smaller and personally I like the design better than the Jabra wrap around.-Love the fact that I can use the Treo 650 chargers with the headset without charging cradles and such mess.-Volume and pickup buttons are easier to find while on ear.-Interference from my WiFi network and cordless phones is much less noticible. However, it still pops and clicks if the phone is more than a few feet away inside my house. Outside, away from 2.4 Ghz transmitters works best.CONS vs Jabra-Speaker rests on top of ear and makes hearing more difficult when background noise is present. It could stand a few more db of volume for crowds and noisy cars, like my Focus.-Randomly loses connection with the Treo 650. However, this could be a Treo 650 problem, since I used the Jabra with a Sony Ericsson T637 longer than the 650. This doesn't happen often, maybe twice in two months.All in all I like the Treo headset better than the Jabra, except for the listening sound volume -- it's not horrible, but right on the hairy edge. If you have diminished hearing it might not work well for you. Hence the reason for 4 stars.