Sold my 01/IV and wanted to share some parting thoughts (echoing what others have already said).
I like the form factor/layout and overall it feels nice to use (except the switches, which are on the budget side).
Sound is subjective, but I’d say that the demos currently available online give a fairly good representation of what to expect.
FM is a nice inclusion, though it is limited to the analogue oscillators (triangle and saw waves).
I’m in two minds about the mod section. While generous, I’d mostly trade it for more comprehensive midi implementation.
For example, to fully access the LFO requires four physical controls and four CC messages. Using a MIDI LFO from the DN/DT would be preferable to me at least.
Cool little drum synth for sure, but as I like to keep things minimal, time to cut the 01/IV loose.