I have had my Motorola HS850 Bluetooth for about a week.  It replaces a Jabra BT250 which died.  While I find the Jabra to be more comfortable the HS850 is far more functional.  The compact folding design, the seamless integration with my Motorola V551 phone all make it superior to the BT250.  The Jabra wins only on comfort and richnes of tone.