I would have to say, I researched these all ove the web trying to figure out which to purchase. It was between the Q2 and the Blueant Interphone.
Both seemed to be similar offerings for Phone and intercom features other than the following:
The Scala Rider Q2 could connect to 2 other headsets where the Interphone could only connect to one.
The Scala Rider Q2 had FM radio, but I have not heard a good review as of yet. Even those that used FM modulators on their iPods or XM radios were having issued tuning them.
So, for the dollar difference, I purchased two BlueAnt Interphones. I got two units with two mounting kits for $200 shipped. I spent an additional $14.99 + $5 to ship out the flat microphone for my full face helmet. This also allowed me to leave the other stem-microphone attached to my half helmet when riding my girlfriends Volusuia.
So this past week I was riding with this unit connected to my RazR through bluetooth. My girlfriend rings me and I tap the side of the helmet to answer. (I had not setup the voice answer yet) Sound was great and she could understand me perfectly. Minimal engine noise or wind noise in my full face helmet. (I ride a Buell XB12s with factory race kit, it's loud, don't hate me)
Last Saturday, I installed her Interphone in her half helmet to test out the bike to bike communication. I tell you what, there is nothing more calming for a second year beginner to have a voice talking her through traffic and not have to have them on as a passenger!! She loved the fact that we could warn each other of sand in intersections, upcoming traffic, idiot drivers etc. Comm was awesome! Distance was amazing!
She could hear me just fine since I had a full face helmet. Above 40mph there was a bit of whistling until I dropped my shield, then perfect. I got a bit of wind noise off hers since she has a half helmet, but a full windshield on her Volusia. It was very easy to hear either way.
Above 60mph on the Interstate, it was a bit more difficult to hear her. It would have been easy if she had worn a full face helmet. I think we may play with microphone position. We did kick them up to the "high-volume" setting and that helped.
All in all, if you want bike to bike communication, these are the shizzle! We will report back once we get some long rides on the highway. Battery life is the one thing that others said was lacking. B2B burns battery quite a bit faster than Bluetooth.
Good luck. PM me if you have questions, or send an email.
Mark Lawson
Buell XB12s
Fargo, ND