Long battery life, a current barebones Android OS, and water resistancy. No harsh peaks like with the Sonys no exageratted mids and lows like the Sennheisers I returned. I use them while I am working out and the wireless quality is great. With two hands you can basically go anywhere and rock it pretty well. so only trust the lower size. The downside would be when you hear how good these $20 phones sound, the thought of "how much better would the $100 phones be?" is gonna haunt you. The only thing i would say is I wish this could go with a more detailed instructions. I used these for several months and they were a waste of time and money. The moment you pull them out they sync to your device almost instantly. Came perfectly and really fast!