Hi
we have been using them, performed well on our June trip to croatia-bosnia.
Advantage is no leads to plug in just jump on the bike and go.
I found the top of the range autocom a hassle and next to useless as a communication system for a motorcycle.
The Bluetooth to the Garmin 660 is vey good.
Music is not too bad dual sterio they call it.
Easy to fit onto the helmet and the speakers are compact, you can easily move the Boom mike around, great when you are pulling on your helmet, just push the mike out of the way.
(I could not stand the autocom mike touching my lips all day as recomened).
A big advantage is that my Wife has her own bike and it is good for Bike to bike as long as you are within 50m of each other.
The rider communication was good but I have to speak loudly and then repeat the first couple of words again once the Vox has kicked in.
I had no hissing at speed.
The only problem is that the bluetooth sometimes does not want to play and does not connect then sudddenly comes to life.
The batteries last for ages.
Conclusion: its a good simple system that gives a basic level of communication OK until the next generation of bluetooth arrives.