Which? has just done Bluetooth headsets.

It could only find eight to text – two from Motorola and Jabra, one each from Plantronics, Nokia, Logitech and Sony Ericsson. Best buys were the Jabra BT250v and BT205 (both about 70%) plus the Motorola H500 (68%); but the lowest score was 60%m so there wasn’t a lot between them.