Latest version is good, but no Mic Boost has been a problem for me. After emailing the developers Im glad to say that the next version with have Boost back. 4 stars until that new version, 5 then if it works!
Previous review
You know how people ask you why you didnt answer the phone or, worse, why you didnt answer when theyve been calling you and calling you....its because you were blissfully unaware that they were calling you because you were listening to music on your headphones. Now, with this app turned on, you can actually hear them screaming at you and miraculously go on listening to the music at the same time. It takes a bit of getting used to, but youll never say "sorry. I couldnt hear you" again. The upgrade has made this version smoother yet - still wouldnt advocate using it in a very noisy environment, which will only disturb your enjoyment of what youre listening to to no good purpose, but its great if you want to avoid being mown down by that car you never heard coming or that partner you never heard shouting at you.