I have one with the cv/gate ports in the back and…I’ve essentially never used them.
I don’t have an extensive CV set-up, so I can imagine someone getting some interesting use out of them. I think you could probably do some cool stuff with an Ansible or use the gate inputs to get some interesting filter triggering* and it’s stuff I’d like to try someday, but I don’t think the instrument feels lacking without those ports.
*I realize now this this is impossible and it’s my biggest beef with the CV ports on the Perfourmer. Gate triggers can only be routed to the VCA, not to the Filter. I’d honestly trade Gate inputs for Filter CV input, if such a thing were possible.