I brought the Motive 3s not having heard the other models but from other comments they seem to share a lot of the same traits.
The Neat Motive 3 do not have an obvious shortcoming in producing the fullness of sound and frequency range I liked. Something just sounded right, they really have a zest and engage you.
I don't have a problem with treble and can listen to most of my cd collection without wincing, even my dodgy old rock / metal.
They do sound amazing still at low volumes but can still handle high volume given more space and on stands and my mate (who has B&W cdm 7nt floorstanders) was quite surprised how composed and punching they are at high volume. passed gladiator soundtrack with ease
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Would love to hear what the Momentum's can do!