We have been using the Scala brand for about five years. The only problem ever was the original mics failed, they had been updated and Scala rep replaced both of them at Bikeweek (in the Helmet Shop). We have the Tandem Pro's, I am not sure they still sell this model, it is intercom only (no ability to talk to other bikes and has only bluetooth range, about 33 feet). We wear modular helmets and the Scala works great. I originally bought them to also use with the GPS but disabled the connection as it was irritating to me, everytime we started a conversation it would interupt with a command, then you have a specified amount of seconds before intercom returns, we just did not like this, I have no problem just glancing at the GPS every once in awhile and do not miss the voice commands. When fully charged they stay up for days if you use the VOX, if you bypass the VOX they have to be recharged every couple days. Good product.