If you're like me and enjoy music while you ride but don't like using head phones, this is a great solution.
The Scala Rider (by Cardo).
http://www.cardosystems.com/us/homepage
For the U.S. market there are three models. (Europe also gets the base model "solo" unit but with the Euro conversion and damn VAT tax its more expensive then the Q2)
Teamset Pro, Q2 and G4.
This is a system that fits in your helmet (and yes, full face helmets).
The system uses a noise canceling boom mic, ultra thin head phones and a blue tooth unit that is detachable via quick release. The unit will sync up (via blue tooth) to your phone, GPS or MP3 player. It also has a wired cord for non-blue tooth MP3 players. All versions are water/dust proof.
All three models have the same basic features as mentioned above. The differences are in bike to bike communication, range and battery life and of course price.
Prices
Online a single unit Q2 runs around $150 and the dual-unit G4 set up runs about $350.
Locally they're $210 and $489 respectively. RMCP in Colorado Springs carries these at the retail price. Presumably your local motorcycle shop does too.
Differing model features
Teamset Pro = 2 units that allow for rider to passenger communication. No bike to bike communication. 7-8 hour battery life.
Q2 (Also comes as a multi set) = Comes as a single or dual unit. Allows all of the above plus plus bike to bike communication (2 bikes total) up to 700m. 7-8 hour battery life. ($250 for the Multi unit)
G4 (also comes as a multi set) = Single or dual unit. All of the above plus communication between a total of 3 bikes (plus passenger for a total of 4 people). Up to a 1 mile bike to bike range and a 13 hour battery life.
Important Note
If you want to use the rider to passenger communication, get a paired unit as you are limited to the number of bikes you can connect to (See above). The passenger unit in the multi-set ups piggybacks off the main unit. In other words it is NOT the same as two single units.
They all use noise canceling mics which (reportedly) work very well for cell phone and bike to bike communications. My only experience regarding the mic is using my phone's voice commands to control my music.
They will only pair up with other Scala Rider units.
My experience with the Q2
(Note: The speaker/mic set up is the same on all units)
Basic commands like "play artist Silversun Pickups" and "pause music" were understood at 80mph.
(Note: The voice commands are on the phone, not the scala but pressing the main button on the scala activates the iphone's voice command).
The headphones are pretty good. I was able to clearly listen to my music at all speeds all though they are lacking on bass but it's not totally absent like you might expect with such thin speakers.
I did get the full rated battery life (7-8 hours) out of my Q2.
Overall I'm very happy with my purchase, all though I'm probably going to trade my single unit Q2 for a multi unit since I often have Mrs. Clovis with me and I don't want to "waste" the bike to bike slot on her =P
For the music capabilities the system is worth it but the bike to bike communication is where it can really shine if you have a riding partner.
-Clovis