He's my 2 cents on Bluetooth and the 650 in regards to Headfones
by the way love it for synching and beaming files.

The Jabra Unconfertable Static on both sides of a call.

Plantronics M2500 ( Laptop Magazines best pick)
Crystal clear on my end Terrible sound to the caller.

Just got the Motorola HS850 from a friend overseas
Sound quality is great on both ends mine & who I'm calling.
This looks like a keeper...

The guy with the Volume problem was probably wearing wrong as my brother did when he tried mine It should fix snug against the ear.

Not sure if mine is different from the us version though Mine
came with an adapt