I owned a Microfreak for a while. It was pretty neat (especially for the price I got it at the time) but I eventually ditched it for a Strega which is more my jam.
- The oscillators are not bad, but I noticed the Noise Engineering ones don't sound as good as they do in their Eurorack modules or plugins. Which made me wonder how the Mutable Instruments ones compare to Plaits.
- The SEM-style filter was a good choice for a monosynth/paraphonic synth. When playing chords or clusters, the resonance seems like it has the right character to emphasize some harmonics over others and sweeping it just sounds rewarding.
- The keyboard and mini-sequencer/arp and hold mode were all nice features.
- It felt a bit of a shame that you can't control the VCA entirely with pressure -- you can assign pressure to Sustain but that still leaves the attack stage going to full volume first, then decaying to the level you wanted. Also the pressure seemed like it needed at least some slew limiting because it could be pretty twitchy at times.
- The interface is a mixed bag. Some good ideas, but some things that felt a little off or tedious to work with. On their analog synths, I feel like everything is super responsive, control ranges are just right, and everything feels good -- I loved my Microbrute and the Minibrute 2S is even better. (* at least the synth part. For the sequencer I'd honestly kind of like to chop it off and get a second 0-Ctrl.)
To me they took a step backwards by giving Minifreak boring minikeys instead of the cool controller -- it's less of a freak. But it seems like they enhanced the digital side of the synth engine a lot, as well as doing 4 voices with analog filters. Not particularly what I'm looking for, but I'm curious whether they'll eventually sell the VST plugin version separately.