I have it for one day and I bought it solely for swimming. I read many reviews of various waterproof headphones and mp3 players and I ended up with this one. Not because it was the best or the best value for money, but because it was the only one worth it in the Greek market at the moment I am writing, so that firstly I don't have to wait for international shipping and secondly I have official dealership warranty, and the third reason is that with their physiology you save yourself from cables and multiple devices. Now, on to the point.... I swam freely for an hour. The positives are that I didn't have to stop once to take it off or readjust it because they were coming out or something. It really surprised me in this aspect. I had it attached to my goggles from the beginning on the top and really even in turns with as much force as I could muster, they didn't move or give the impression that they would fall off. Now for the negatives. After about 30 minutes, I estimate, they started bothering me in my ears and in the end when I stopped and took them off, I felt much better. I believe that over time I will somehow get used to it. The biggest negative is that I listen to various podcasts to make the time pass. However, the volume is not the best, resulting in me missing many words or sometimes struggling to try to hear what they are saying. Especially when you increase the pace and the swirls become bigger, the problem of low volume gets worse. For music, it will be fine out of nowhere, but for podcasts, they don't work. If I hadn't bought these for the reasons I mentioned at the beginning, I would invest my money in swimbuds headphones along with a syryn mp3 player that excel in reviews and are available on Amazon for roughly the same price.