Updated review:- Cheapest I'd seen £54 most £120 plus, very good quality product, water proof tested, you get more than you pay for, however I do-not require rider to rider or pillion communication which it hasn't got.
Struggled to fit in Arai helmet because did not want to cut lining etc. Had to adapt to fit on side of helmet with a nylon washer under bolt to get clamp gap small enough to secure- also fitting the additional rubber spacer provided, ok. The speakers Velcro'd to the lining of the helmet without having to use there sticky pads, it took me 15-20 min to fit and set up, instruction clear.
Remote is excellent but battery lasted an hour!!!, an audible warning tells you the battery is low, replaced battery which has lasted so far (month).
The sound quality is excellent, there's a note in the box warning you it's against the law to have 2 ear pieces in on Britain roads, which I did not know!.
Easy to set up and work.
Radio not the best but when you've got a station it's just ok, excellent with blue/t from my phone music (no setting up required).
Phone call Say's the name of caller and you either say accept or reject-easy.
I wear ear plugs and found over about 30mph very difficult to hear even on full volume so I bought "Alpine Moto Safe Ear Plugs" FANTASTIC PLUG, can hear music, tried without ear plugs disappointed-bike to loud, but at least you know you've had a call and you can pull over and use with out taking your helmet off when your stationary. The phone works well and the caller can hear clearly.
A phone call I had whilst riding was a massive distraction and have made the decision I will always pull over regard less, so noise not a problem.
Wearing thick winter gloves I am able to use controls on remote and the side of helmet fairly easily to scroll through stations and functions and isn't complicated.
Recommend for the price, cannot see that the more expensive models can be any better but they may have other functions which you might won't like bike to bike.