Myself and several friends have;
http://www.ebay.co.uk/itm/BT-interphone-Bluetooth-Motorbike-Motorcycle-helmet-intercom-Headset-800Meter-Uk-/251932664862?pt=LH_DefaultDomain_3&hash=item3aa85b641eand find it an awesome piece of kit, I have bought a spare clip and headset for my spare lid, but in my other, I use it daily to listen to Music and make calls, both out-going and in-coming. My Mrs has got it on her lid and we've just linked them for helmet to helmet, and thats pukka too.
Highly recommend. I'm riding around 6/7 hours a day and the battery lasts 2 days, My music is very Bass-y and suffer no distortion, gonna buy another set as back up incase this unit goes wrong, which I hope it dont!!
Have used it in sunny warm weather AND very wet heavy rain, no problems.
Controls are easy to navigate with RST summer gloves, am yet to try with thicker Winter gloves.
Hope this helps