I was afraid it was too big, but this is not the case. Easy to use in water (pass piece after, pause, adjust volume without looking, pressure), I think the sound is good (even better than the bathing cap covers the ears: when the ears are full of water is understood very well when they are empty we hear nothing more). Certainly to have a great sound, stop to swim and put the ears in water (the temptation is great). But swimming front crawl is also very nice. I use it for 3 months and I am very happy. I have not compared with any other system, but I appreciate not having earphone in the ear. Besides so I can try to do it without worry.