I use this as a low pass filter most of the time. It sounds good (nice and gritty) and that resonance really likes to scream. Build quality is really good. You do need to read the (very limited) manual though, otherwise the signs on the frontplate don't make much sense. I found out just by experimenting a bit. Would have liked some video's (hey IO Instruments, ask DivKid!) with instructions on how to use. But this module is DEFINITELY worth the money!
To summarize:
Pro: build quality, sound quality, number of patch in/outs,
Cons: steep learning curve, bad documentation, barely any web resources (jun' 20)