It's a very muffled sound and the ear pieces are not comfortable.

The earbuds that come with it constantly either fall out or do not seal well. I ordered the replacement SPEEDO headphones and found those earplugs (the Christmas tree looking ones) to work great, however the replacement headphones were too small and are probably meant to be worn by children...

Used it for 2 weeks, and it stopped working mid workout. Now I have to return it and hope the next one doesn't break. Go with he bone conduction one, I've heard great things.

I use this product while I am working out and when I swim.
I found the unit easy to use and load with songs from Itunes. It automatically converted the songs to MP3s.
The thing I find annoying is that the ear phones will not stay in your ears regardless of which ear buds you use. I am not sure if I received an older version of the ear buds or not but, the ones I received do not match the pictures. I ordered a new set from Speedo and we will see which ones I get. Other than that I really like the unit and hope it lasts a long time.
MM

I am very happy with this player.  I can clearly hear music, and understand spoken voice (for podcasts, or books on tape).  I have tried a few waterproof players, and this one is the only one that ever worked to my satisfaction.   I find the earbuds frequently need adjustment, but I think I need to switch out the earbuds, to get them to fit me better (which I hope will solve this problem).  I am very happy with this product.

It was easy to load music on it, I just have no idea how the program works that came w/ it. I was able to just open the player as a folder and click and drag songs from iTunes into it. I have a hard time hearing the music while swimming, because swimming is louder than you think and the headphones keep coming out.  However, I do have a problem w/ earbud type headphones staying in general.  It worked awesome when I used it kayaking and snorkeling.  I might try different headphones for swimming laps though. Overall it wasn't the same experience as biking or running w/ my mp3 player.