I've been looking for a pair of cans for the office as my Westone ES5s are just far too much of a hassle to keep taking in and out with people constantly dropping by. The ES5s are also far too distracting to work to as they forcefully DEMAND one's full undivided attention. I find them to not be the best match for the office.
To replace the ES5s at the office, I've been looking for something that sounded great, looked great, did not require an amp, was comfortable/compatible with glasses, and isolated reasonably well. I auditioned a significant number of mid-fi cans including but not limited to everything at Best Buy and the Apple Store. Some of which I bought (most recently the AKG K550) for extended auditions and ended up returning.
I'll start out by saying what I believe should be obvious: the MOMENTUMs are not for you if you are looking for neutrality or an expansive soundstage. The MOMENTUMs are sealed, and are not reference-grade critical listening cans nor are they marketed as such.
However, what they may lack in analytics is made up for in musicality. The MOMENTUMs are absolutely phenomenal for the use cases that they were designed for.
The MOMENTUMs are a lot of fun: they are visceral, pleasurable, stylish, and comfy. Sennheiser has characterized them as "rich and detailed," and I have to agree. The mids are forward and the highs are neither harsh nor fatiguing. If you like bass, you'll probably like these cans. The bass is not muddy, bloated or over-bearing; it's tight and punchy. However, don't expect quite the level of texture and sub-bass that you might find elsewhere.
The MOMENTUMs, for me, are perfect for listening to while at the office. They let me get into the "zone", energize me, wrap me in a productive bubble, and isolate chatty coworkers. I want my environment to completely drop away, leaving just me and my work, and they do just that.
All in all, out of all of the cans I've auditioned, the MOMENTUMs are the ones I'm keeping.