We received our set a couple weeks ago from Revzilla. I ordered from them because I found a code on ADVrider discounting the set significantly (I'll go back and look for the code if anyone is interested). We paid $369.99 for a pair of headsets, which I thought was a pretty good deal since the listed price was $440.96.
My primary purpose for these was to talk to my wife when she rides with me. I like the ability to answer a phone call too. This is the first intercom system I have ever used. We've only used it once, and I am happy with it. It was easy to install on my Scorpion helmet. We had a hard time figuring it out at first, and when we started riding, we left the channel open, and we both got a lot of wind static noise. I switched over to the closed channel, and this worked much better. It was a little tricky to start a conversation at times, and after attempts at yelling various words to "start" the conversation, I found the best luck with "yope".
It was pretty funny initially- I didn't think the channel was open once and started yelling to open the channel, and my wife screamed immediately- apparently it was already open. Later, we were driving through a city and she was trying to open the channel from her end, with no luck. I nearly had to pull over because I was laughing so hard at all the people looking at us wondering why she was yelling. It seemed to work much better at higher speeds/ more wind noise.
The one time I tried a phone conversation with it, she could hear me fine, but for me to hear her she had to yell. I need to figure out how to work this better. I haven't tried any music with it- I have the first gen iphone, and I don't think it does stereo bluetooth anyway.