My wife just got me 1 of these last week @ Walmart.
For it's size, it has great sound. The BASS is good no sound distortion at highest volume, sound is crisp at highest volume,
battery life is good 10 hours or so, it'll fit in your pocket, construction is very good.
I use it every day. Plan on using it in my CUSHMAN GT1 golf cart when it warms up.
Con: it has a built in mic so you can use it as a speaker phone. (Press the play button when your phone rings to answer the call.) It sounds fine on my end, but I'm told it has an echo or tunnel sound on the callers end.