I've only got a couple rides in using the Collet Sno-Fones that I purchased last year, but I will share my experiences so far:
1) price & design- reasonable, pretty decent valure for the cost, I thought. I liked the design, the fact that the unit's battery is kept inside your warn jacket inner pocket someplace, and the part of the unit on the outside of the helmet was fairly small. Attaches using a "velcro" hook & loop system, which allows for fairly easy removal or transfer to a different helmet, I suppose. We just leave them in place on the helmet, though.
2) installation & setup - The install was pretty easy, at least in our case. We are both using a fairly inexpensive Bieffe full-face helmet. There were already small pockets in the area of your ears, and that is where the small helmet speakers velcro to the helmet liner. Some helmets may need more work to install the speakers, depending on design. The wiring for the speakers, coming from the radio unit itself, all tucked into creases in the helmet liner, virtually disappearing once pressed in there. These units are voice-activated, so you have to set the microphone sensitivity up to turn on when you begin speaking. I found this to be a small challenge, as the unit "beeps" in the speakers when the mic is activated, and then you also hear your own voice thru the speakers, at the same time that you are broadcasting to the other unit(s). Exterior controls consist of the mic sensitivity dial, a speaker volume dial, and a push-to-mute button, which mutes your mic until pressed again. The boom mic from the radio base unit reaches under the bottom of the helmet, and the mic ends up just touching your lips, when installed properly.
3) use - First off, I found it a bit tricky getting the mic sensitivity set just right. set too low, it will come on with wind noise in your helmet, or the engine sounds even. Set too high, and you need to really yell to activate the mic. What seems to work sitting in your house, isn't gonna be effective once on the machine and riding. Once you get the mic activation set, you will likely have to train yourself to speak in a manner that will broadcast well.
I tend to talk a bit too fast ordinarily, and had to keep reminding myself to speak slow amd more deliberately. They are not really useful for having a conversation while riding, but I did find them helpful to let my wife following me, know that there were oncoming riders, and icy spots where they happened. I found them to be more useful when stopped and going over a map, it was easier to hear than trying to hear someone yelling behind their own helmet. I do find the sound of my own voice thru the speaker somewhat distracting, if I could change one thing, that would DEFINITELY be it.
Often the mic would "think" we were done talking, at a slight pause in cadence, and there would be gaps and we'd be asking "What?" quite a bit.
it was difficult to really get the broadcast range figured out, as we are still working to get the mics set up properly, and sometimes I think that some of what we were saying wasn't getting through to the other person. were advertised as have a couple mile range, but I haven't seen anything near that yet.
Our units came with a "Groomer Beacon" receiver. Supposed to start beeping if you come upon a groomer on trail that also has a beacon transmitting. Never had a chance to test this yet, but I do like the idea at least.
4) opinion - I do not regret the purchase. I do look forward to getting them dialed in just right, but have struggled a little bit, partly because my wife is not the most patient when it came to setting it up, and unfortunately it's not something that one person can do by themself. They worked all day we were out in -30F weather, just got a little ice buildup on the mic due to it being right on my lips. I never even feel the unit itself on the outside of the helmet while riding. I do find it to be ALMOST in the way when removing my helmet, but am slowly training myself to be aware of it and be careful.
'98 Polaris XC 700
Lotsa miles, some bolt-on's
'99 Polaris XC 500 SP