Well these aren't actually on my ATV but they sure are a nice addition for riding the trails with my wife / buddies. I scooped a set off of Ebay and installed them couple of weeks ago. Got them tested on the trails last weekend and they work very nice.
I got them for me and my wife so I can trail ahead and let her ride at her own pace and she can get in touch with me at any time out there. It was a bit cold for my wife to go riding last weekend so I installed on on my buddies helmet so we could test them out.
They are supposed to work up a mile away but in the forest they work probably a half to quarter mile at best, and they lasted the entire ride plus some. These actually allow you to pair your Bluetooth phone and MP3 player, so I was jamming pretty hard to some tunes while we were tearing up the trails. Anytime my buddy wanted to talk the music would automatically cut out and i could hear his voice loud and clear.
I'm quite pleased with these. Buy no means are they worth the $500 dollars that they have posted on the Cardo website, but for a solid deal on ebay you can have a pretty nice way to communicate out on the trails for $300 bucks.