I've now had my jh13s for over a year. Though I love my O2 rig, my jh13s get more use, and make me as happy every single time. Due to sq, convenience, and pure pleasure factor, I consider them one of the best purchases I've ever made. My O2 rig is better sq, but I can't move around with it and can't toss it in my purse. The jh13s with a simple ipod and pico slim still offers amazing sq, and I don't feel like I'm missing a thing, sq-wise, when listening.