Actually I was just thinkig the same. It's not much different from an ABM, I think the only difference is the Taurus input. Besides, I thought there was no comp nor sub-harmonics (which I'd prefer, because I don't use any of that in my amp) but it seems that the amp has both, but not they are not configurable, which I think it's worse. I cannot say that I wouldn't buy one, but for that amount of money, I'd probably get a Dual VU ABM.
PS Maybe the valve drive is different. I'm not sure about that.