This is the system we use in our RZR...we have a rear seat and two children they use the Scala Rider sets...me and the Wife Scala Q2's...attached them to Ear Muffs...Peltor Juniors for the kiddos...and
Leightning L2F Earmuff-Folding Ear Muffs for us...best deal on ebay from 3AlarmDeals...Cardo is coming out with an Eight Person capable unit in January 09, but price is going to be around $250 to $300 each! The Q2's can communicate with 3 people (including Scala Riders)...all have a FM Radio on board so you can pick the sation you want and save up to 6...Bluetooth works great with garmin GPS I have the Zumo 550...also BT works with my wife's phone and mutes radio automatically...will continue testing...
We all wanted to be able to communicate better and protect the kiddos ears when crusing...the kids can have FM on the Scala Riders but we don't let them listen...too young!!!
Pros: A little over $500 for everything
You can purchase extra headsets at Cardo cheap for additional Helmets...when I ride my Quad I mount mine on my helmet while she is in the RZR...basic line of sight communications up to 200-300 yds max...I know it says 500m, but it's asking a little too much...
OK the Cons I can communicate with my Wife and one child, she can Communicate with me and one child so you have to relay messages sometime with 4 of us...
SCALA RIDER Q2 | CARDO SYSTEMS INC.