ive got a sena smh10 and i have a smh5 on my stepsons helmet , its very user friendly the speakers are a bit better on the smh10 though, id be lost with out it ,,people cant believe that your on the phone to them as its so clear,even up at a decent speed,5/6 hours use out of a charge,,the smh10 can connect with up to 4 riders where as the smh5 only connects with 1