The sound is top notch! very good ergonomics.. Ease of use.. battery life is OK.. compact when you need it pit away until this little knob thingy that holds the headphones together and makes a clicking sound to lock itself gave way!! and I couldn't find that little piece!! wtf! Now u can't lock this POS! there goes my 50 bucks.. unless you super glue it permanently for which it defeats the purpose!! shet!