Ahhhh, just got the Jabra 250V.I'm istening to the DroneZone (shoutcast.com) radio station as I type this. It sounds terrific. The Jabra 250V fits like a glove and doesn't feel as if it would fall off at all. I feel as if I could jog, run, or do anything and it would stay on. The ear bud comes in different sizes (several included) and I choose a large one to drown out unwanted noise. It inserts into the ear and makes it very easy to hear, with lower volume than the Motorola.
It is slimmer and more flexible than I thought it would be.
I haven't noticed any echo, and there shouldn't be any with this configuration. Distortion and crackles are at a minimum
It scared the bejesus out of me when I first put it on and tried to pair. It started to vibrate pretty radically and freaked me out! You arn't going to miss a call I can tell you that. Perhaps there is a way to turn that down a little, I haven't got that far.
I paired with my phone (Cordless Uniden) and my Laptop. The next trick will be the Widcom stack for the Axim which now supports headsets.
I like the Jabra 250V better than the Motorola HS850.