As a product for keeping your player dry

As a product for keeping your player dry (which is it's prime purpose), it scores 100%. There's no way the water will get in as the sealing mechanism is really robust, albeit a little bit fiddly. And it floats, too, so no problems there. Where it falls down completely for me is that the type of plastic used is the equivalent of frosted glass - I can't see what's on the player's screen! Annoyingly for me too, is that the type of player I have has a mechanical rotary dial so that if I want to do any list navigation, volume control, etc., then I have to open the pouch and reseal it all over again (assuming I could see what was on the screen in the first place). If you're going near water, you'd be silly not to have this or something similar, but with certain players you'll need to make playlists in advance, set your volume and equaliser as best you can and make do. 3 stars seems a bit harsh for a product that performs it's main purpose brilliantly, but not being able to read what's on the screen because they didn't use clear plastic is just plain stupid. Also, because of the thick grade of the plastic, if your player has any small and fiddly buttons (especially side mounted), you won't be able to activate them.

Does what it says on the tin

Does what it says on the tin.