I'd have to agree with this. I find it warm only in the sense that it doesn't exaggerate source material that is already borderline bright. It's certainly not colored enough to paint a magical illusion over poorly recorded material. As Faudrei mentioned in his review, I find the "coloration" to be in the area of harmonics, not frequency response. It could be that the topology of the amp is engineered to retain certain small amounts of the "euphonic" harmonic distortion, similar to tube amps, but in smaller amounts and not affecting clarity and black background like some tubes might. Though it is a pleasant coloration to me, and doesn't detract from the clarity or detail of the amp. I'm very hesitant to say it sounds like tubes because it doesn't necessarily, and "tube coloration" already conjures up certain preconceptions that I don't think apply to this amp.
Also, the exceptional sense of space and depth in the soundstage could be taken by some to be larger than life and be considered a coloration. When I first got the amp, I thought it was really laid back but after further listening I realized this was simply a product of it's increased soundstage and was still fully capable of an intimate sound when the recording calls for it with plenty of impact when called upon. One thing I want to emphasize is that this is in no way a slow or sluggish sounding amp. I think what is so "seductive" is the non-fatiguing presentation combined with a sense of speed and clarity normally only reserved for more ruthlessly neutral amps. Almost similar to how an LCD-2 can be both warm and fast at the same time.