Know it well Dennis. BUT....
It's not a direct replacement for the arranger control of drums. Great with loops, evolving textures, you name it, but you can't do fills, intros, endings on the fly easily, and it comes with very little usable content for what most of us here do!
I think that user intervention is VERY important. I don't want a machine making decisions about what it is going to do without consulting me first! At least about where it is going to fill or pickup, and what pattern it's going to next!
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An arranger is just a tool. What matters is what you build with it..!