Wasn't sure about this at first - it pairs very easily with my phones and audio players but the sound wasn't what I expected, a bit too thin for my taste. BUT... after a few hours using it the speaker came into it's own. The sound matured quickly to supply a reasonable amount of bass and clarity and the speaker itself is tough and able to handle the usual knocks life throws at these kind of things.
I can attest to it's claim of being waterproof - this has been used in the shower and allows enough volume to drown out your own singing so nobody can hear how bad you are!!
Fantastic build/sound/value for the price, I'll be getting another one for my kids to use in the garden.