I have 3 bluetooth headphones:
1) Apple Bluetooth works fine when I am just monitoring the iPhone for phone calls...no music playback.
2) The iSkin Cerulean F1 with the TX Transmitter works great for both listening to music, sounds are average, answering the phone has not been an issue on either end. The only downside to this setup is the wire between the two earpieces. It is fixed and non-removable so if you just want to use the phone feature, you have a dangling piece that pulls on the other (while driving for example. Cant have something on both ears)
3) Jabra 8010 with their iPod transmitter. Have used this but it is now a backup because I had music cutout to frequently and the two pieces are kind off bulky (too large) while wearing and after awhile gets heavy. However the two earpieces unplug, giving you just a phone bluetooth.
If i could take the plug/unplug feature of the Jabra and put it on the Cerulean's then I would have the perfect setup. All three are currently paired with my iPhone so that which ever one I want to use will connect as soon as I turn it on. Hopefully, in the near future I will be able to drop the transmitter!
Hope this helps, Good Luck