Agree with @karst–the 12 bit ADAC, plus the analog stages/compander make the BIM a compelling delay that imparts a certain vintage feel. OTO gets a lot of things right about EQ of inputs, outputs, and feedback loops, and overall control of parameters. Denis/OTO is going for a late 70’s/early 80’s vibe at the core of all his boxes, and it’s a consistent, rich vision. With the set, you get fx that work beautifully together, and a consistent set of interfaces that makes performance and recording easier. I like buying groupings of gear from the same maker when there’s a clear vision that aligns with the music I aspire to make.
But it’s just one path to achieve a certain kind of sound, so a lot depends on what you already own and works well for you. Before I got the set, I didn’t have any outboard effects (only modular fx), and I wanted effects for the sends and master bus that would complement the SSL Six–with it’s modern studio EQ’s, and compressors. Not much overlap between the G-series bus comp in the Six and the Boum.