I've researched various underwater sound systems online and this one was the top recommended on several websites so I've only tried this one and no others. But the sound quality is as good as on dry ground. While the included earbuds work well underwater, they wash out during a swim (I freestyle/crawl 2.0km in about 50 minutes, so pretty slow and leisurely), so I highly recommend the Underwater Audio Swimbud waterproof earbuds to buy Flex. I'm an Android user so I'm not very good with iTunes and Shuffle, but I'm not that good with everything and I import my music files (in MP3 format) into Shuffle. It's very important to figure out how I can import my playlist into the shuffle as well (it's possible, albeit a bit tricky, unless you're an iTunes guy who asks you to search the web).
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