Those are definitely advantages. The Schaller has a similar profile height, but it is not as smooth. And the saddles lock with one screw, instead of the six allen heads. But the rollers do not lock, so you can change the spacing by accident, and it also springs so the noise issue would be there as well. Head to head the ABM would come out on top.
But supply issues suck. I have to deal with those on my day job....I don't have much patience for that particular problem. That would turn into a good excuse to try something new.
SR