They are very different devices. Both of them mount as an external drive on my Mac and both only play mp3. (No iTunes music store for you!) The Dolphin has earbuds that double as ear plugs, but the rubber buds tend to fall off and I've almost lost them a few times. The SwiMP3 uses bone conduction. The bone conduction works fairly well, but is weak on the high-end compared to the Dolphin. The SwiMP3 also tends to be audible from the outside when you have it jacked up enough to groove to.
One other problem I've had is that Japanese pools tend to be more crowded and stuffy about things like no-jewelry rules and caps. I have a feeling I'm going to be told that I can use them. So far I've been sneaking them in.
Overall, the experience of listening to music in the pool is relaxing and fun. However, it does sort of distract me when I'm trying to focus on fixing my stroke.
Has anyone tried any of the other under-water music players for swimming?
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