Many people associate "neutral" and "detailed" with bright, "refined" with edgy etc. The Momentum is actually very true to life. Warm, smooth and natural yet airy and detailed. Slightly gravitated towards the lower end of the spectrum and forgiving up top but that's just perfect for portable use in my opinion.
I've been enjoying the MOMENTUM with a treble boost recently. I find it livens up the MOMENTUM up nicely.