I purchased this unit because it seemed to fill my needs; and that I've had very good luck with other Plantronics equipment.But there are two problems that prevent me from using this product.1. If there is a way to attach this to my ear so theearpiece is firmly attached, I can't figure it out.Maybe my ear is too large! But whatever the situation is,it keeps dropping off if there is the least little ( ! ) tugon the wire.2. There are often times where the people I'm talking to (especiallyin a teleconference) just can't hear me.Also what I didn't expect is the need for an adapter so it can pluginto my Blackberry.