Sennheiser's original Momentum headphones were well-reviewed by pretty much everyone... except me. The cold hard truth is that I made a mistake. I reached out to Sennheiser about giving me another chance with a bit more time hands-on with these headphones, and they were willing to give me another crack at them.
The problem is that last time I borrowed them from someone and I only had them for a few hours, which really wasn't enough time for them to be broken in. This time around, I was really really impressed.
A side note is that I'm trying a new media player on my HTC One (Apollo) that has made sound quality dramatically better. I'll be doing an update on this software at some point as well.