Our stock Honda GL1800 headsets were loud, but had no noise-reduction for air blowing past the helmets and other wind turbulence that helmet mics will always pick up, which creates noise that the bike's audio system will mix with our voices through the intercom. Couple that with most non-current-year's GL1800 models' inability to allow two-way cell-phone conversations without expensive modifications and you'll have a system that works fairly well at low speeds (under 40 mph) but becomes unpleasant to intolerable as the speed increases. Even wearing custom-molded ear plugs the voice to wind-noise ratio is such that the voices coming through the earpieces are hard to understand, and can often become quite hard to understand above 50 mph as speeds and wind buffeting increase when approaching Interstate speed limits (65-70 mph).Enter the Lexin B4FM--as the wind rushes by you'll hear it, but NOT through the B4FM's speakers (one in each ear). And--different from the bike's intercom, you won't hear your own voice when you speak. You'll only hear your fellow passenger on the bike.Does wind buffeting sometimes make your co-rider hard to hear? Yes sometimes, but it's only because helmets themselves are often not well sealed around the bottom and back, where air can cause noise within the helmet due to vacuum from air rushing by. As nearly as I can tell little to none of this air-buffeting is audible through the helmet system. Though the mic may pick it up, the noise-filtration of the B4FM works effectively to eliminate most everything but the voice of your co-rider.A note about wearing ear plugs: We do so because to go without them is to be gradually deafened by the buffeting wind and other noise of riding at speed. They are highly recommended by experts, including ear specialists to protect your hearing from long exposure to high noise levels. That's the only reason we wear them. This requires that the helmet speakers be loud enough to reproduce voices intelligibly despite the ear plugs--and the Lexins do this pretty well. Do I wish they were just a little bit louder? Hmm. I'd have to say yes, I do--although I don't have to ask for a sentence or phrase to be repeated often, occasionally a repeat is needed at 65-70mph.NOTE: the picture I'm showing is the helmets before testing--I had just installed them, which brings me to what I consider is a winning issue--these were the quickest install of any I have ever performed over years of fitting aftermarket intercoms and headsets to helmets. I installed the first in 15 minutes, and the second in just under 10 minutes. If I hadn't been so careful in the effort, it could have taken less time.ACID TEST, BOTTOM LINE--we just finished an over 1400 mile round trip to the eastern mountains (from Illinois (the land of endless corn and soybeans) riding the interstate on flat land, and the curviest mountains we could find when we got into the mountains. We considered these a big success, much better overall than the stock GL1800 intercom system, with little to no noise transmitted through the earphone speakers, just our voices.Disclaimer: I didn't care about listening to music, just my partner, so I didn't bother trying the radio function. Also though we paired our phones to the devices, we received no calls while we were riding, so that function didn't get tested either.The mics can get turned away from the rider's mouth, so an improvement would be to implement a way to keep these properly oriented.The clamps that hold the devices to the helmets can pull loose, so a nylon or plastic set-screw that could hold them onto the helmets might be a way to prevent them from coming off while handling the helmets. We never noticed them loosening while riding, only now and then when handling or carrying the helmet. These things can be a pain to attach to the helmet, and while the included spring clips can be attached to hold the plastic clamps open for attaching, you'll want to remove them immediately afterward. They are unsightly and will get in the way if left attached to the clamps.