Tried out the HP100SE at the audio show today and it's not for me, darn thing sounds like an SR325 with more resolution and a bigger soundstage. It's too bright for me and it doesn't have the midrange magic of my RS-1. The overall frequency balance sounds like it was tuned for fans of the Senn HD800 or Stax 9000 series, it seems made for people who like a brighter more clinical sound that emphasizes detail & resolution. Yes it's punchy, dynamic, and checks the usual audiophile boxes, but way too much of the music I like just doesn't sound good.
I think the Grado S950 beats the snot out of it any day, that one sounds like an RS-1 with Audeze LCD-XC soundstage & resolution, way more musical & forgiving and as far as I can tell in show conditions it doesn't give up any detail & resolution to the HP100SE.