I have had the Jabra SP200 for about six weeks now, it is absolutely brilliant!
Amazon price of 1p under £18, compared to £35 at High Street phone shops made this a good value purchase. Ordered on a Sunday Evening, delivered on Tuesday - good going.
Ease of use - so simple, charge it, connect to your phone, put it on the sun visor, press the button when you get in the car.
You are ready to receive calls.
I get over two weeks of use between charges, but considering that I don't switch off when I park the car overnight at home or when I am at work, so the Jabra is on standby all of the time.
Well worth the money! Highly recommended, especially at Amazons price.