Bought these headphone a month ago. Open it, and I tried it on. After 15-30 minutes of listening, I was amazed! These sound better than any IEM I ever came across. And I tried Klipsh s2, Logitech Ultimate ears, Westone 4r, Shure 425, and Hifiman re-400. For Full size headphone I tried Grado 225i/e, Grado 325is, Grado RS1i, Hifiman he-400, Hifiman he-500, V-moda M-100, and Sennheiser HD650. This is by far the best one out of all. The sound is detail, with great mids, and non-harsh treble. It can handle any Any genre, including, Dubstep, dance, pop, and hip hop without any distortion. I used it on my android Note 4 and it sound fantastic. I used Spotify and set the sound to simulate tube amp and turn on the clarity and 3d to make it sound better, I left the bass enchancment off though. After doing that it sounds perfect to my taste on my android/spotify app. I am currently using it hook to my PC's Xonar essense STX and it sounds even better. I guess you can benifit from an amp. My current headphone (grado225e) Now sounds like poo after listening to the UM Pro 50. I think it's worth every penny paid for. I will be enjoying these for a long time. I hope this gives idea of what you can expect from my point of view. Now to enjoy my jams!