Personally, I use one with my Digitakt/Digitone setup and it is VERY complementary, providing all sorts of live analog goodness and even serving as a fantastic sound source for Digitakt sampling.
In spain it is cheap too, it got down to 249€ for blackfriday. Very nice machine that can double as a sequencer, for modular too ( monostation, 0-coast via midi and DFAM via CV in my case)
I can confirm the Mono Station is a nice little box. If they would add afx mode to it as on the Bass Station 2 it would be even more so. One can hope…