I bought the Plantronics Backbeat 903 wireless bluetooth in-ear headphones in December 2009 and they weren't perfect but offered lots of benefits over traditional earbuds. Shame they died after just 1 year.
Ease of use: 8/10 Sometimes wouldn't connect with my Samsung G600 but freedom from snagging wires!
Comfort & fit: 6/10 Earbuds had an annoying habit of not staying put and wire at back can snag coat collar
Looks: 9/10 Discrete and hitech!
Range: 8/10 Up to 5m from my phone
Battery life: 9/10 Lasts all week (2 hours per day)
Features: 8/10 Bass boost, microphone (hands free calls and for listening to bystander/announcements)
Reliability: 2/10 Mic and pause button broke off at month 6. Completely died at month 12. Hmmmph!
Overall: 7/10 Would recommend but for comfort and reliability.
Loved - Stereo music listening combined with hands free calls freedom - no irritating wires! The sound quality is actually very good when the earbuds were in place (which was never for long).
Hated - Dying on me just a few days after the guarantee expiry. Though adjustable, the earbuds just wouldn't stay in my ear canals meaning that I never got the best sound. But perhaps I have unusually shaped ears.
Summary: Worth a try if you are not strapped for cash. If they fit you OK and your set proves reliable you will love them!