I certainly wouldn't call the Momentums "balanced". They are too bass tilted and the treble is too rolled off. I would classify them as a natural/warm headphone that can bring the bass. I still think they're very good headphones though. I prefer the P7s to them, but I'd take the Momentums over the K545s.
Really, the lack of any treble didn't bother you? For me that was my fatal flaw when I heard Miles Davis sound like he was playing behind the drummer. I actually prefer the Momentum on-ears for that reason as they do a better job of this.