This is my third day with the T20i Blacks and I absolutely love them! The whole experience, which I could describe in excess is something phenomenal. From the moldable ear hooks to the insertion depth to the massive sound. (The mic also works great!) Once you set them, the fit and comfort is something I doubt will find much competition in the universal IEM-world. And they're so easy to put on. 750s were a bit flimsy in comparison. I can also do anything with them. Running fit is great, they don't fall off. To me they're not even weighty at all, coming from the 750s. And about them being hard to drive, I don't even have to go to my players loud limit (half way to max) to get uncomfortably loud. Don't know why with the 750s I needed to go over the limit often. The sound is so great that I'm smiling all the time just because of how engaging it is. The bass, oh boy. The isolation is so good I'm near completely shut out from the outside world and left to the soundtrack of my life. Its like I'm in my own cloud of sound, a movie. I dare to say this is somewhat of a comfortable limit in resolution. More, and they might be too hard for bad recordings etc. I do like to listen to youtube rips along with my flacs TYVM. Thank you RHA, worth every cent!
Sorry, I wrote this in a hurry.