Some important tips on passenger to driver comms.

1. Will you like to be tethered to the bike with a cord? (mine hated it)
2. Besides talking to each other will you be listening to music thru helmet headsets too? (if so do you like the same music)
3. if you choose bluetooth how long will the battery last when playing music full-time?
4. Do you ride with other riders and what do they use if you want to communicate with them?
5. Will the headsets no matter which type fit properly in your helmet?

This is not a cheap investment no matter which way you go. In the end, we decided to remove our cables and the wife listens to her iPod or Pandora through her phone or she listens to music from the front speakers. When she needs something or wants to say something she simply leans forwards and tells me.

Hope this helps.