Do you like using the ER-301 that way? I’ve been considering that for a very long time, and I would love an opinion. I picked up a Sample Drum recently as a kind of half-way, which I haven’t quite dug into yet, but will take some learning. ER-301 chains seems really intuitive to me, but I’m also heistant to “use it up” with drums? 
I wish the Blck_Noir was smaller, but it’s hard to imagine letting go of even if I don’t keep it racked permanently. As @freqout noted tho, you need to dig it’s sound (which I do). I usually want more umf to my kick tho, but it layers really nicely with other drums. The onboard effects and aux input are nice.