I don't know about others but Jabra 500 works best with my Treo-700.Its sleek , fits ok & is durable. I am not sure whether it is the new Treo-700 or the Jabra [since i had before treo-650 / jabra 250v] but the Jabra 500 pairs pretty fast when i receive or dial a call..the call is crystal clear to an extent [not when the cell phone is in motion]. good distance coverage as well...I would recommend it because i have been using jabra for a while & like their behind the ears design..