1st test pool: excellent sound quality! Ergonomic buttons that are easy to handle (one of my fears), much better listening experience with the aquabeat speedo.
Small problem: the supplied headphones do not allow to dive (as soon as one comes down to more than 1 meter, the sound is blurred: to test with other headphones, but it does not feel swimming breaststroke or crawl.
Very satisfied with the quality of this ipod. I recommend it to anyone who can not do without music while swimming.