What I really dig is how the highs sound so smooth in a good way, enough sparkle but never too harsh or shrill. l'm currently listening to tracks that l know very well and can tell exactly when other earphones sounded shrill. Also, and this is without a doubt, burn-in has helped them quite a bit. Out of the box they sounded good but highs felt a bit congested but the thing l noticed the most that they were not loud enough playing music but were plenty loud making phone calls. Left them with 20 hrs of pink noise burn in and then tracks and they got louder without a doubt. I wasn't using them in between and actually switched to my Denon which is my daily driver so I'm positive it wasn't a mental burn-in.
That's one of amazing things that M200 can do magically.