I have the SENA. It's a good unit. I haven't tried any other units. My wife is electronically inept (love you honey!) and she was able to use it proficiently. I bought the headphone adaptor and prefer it to the helmet speakers. I think the helmet speaker volume is awesome but the sound quality is crap - tinny with no bass at all. The battery lasts forever, and they don't lock up or crash, and they are easy to use. We used them for our big summer trip, and the only problem we had was that somehow I got mine on vox and couldn't remember how to fix it. It would make the person-to-person drop out all the time. Once I figured out how to change it back, everything was well.