Echoing @Cloud on the keys: They’re nothing special but that depends on what you’re coming from. They’re still small, you get used to the spacing. Quite serviceable. (Edit to add: They bottom out softly, not with a mechanical-switch click; I kinda like it and it’s surprisngly easy to perform a gliss.)
I still don’t have a good feel for the acceleration on the encoders, sometimes I’ll spin them just fast enough and they’ll engage warp-speed. Probably just me being too enthusiastic. It’s good to have acceleration versus not having it at all!
The onboard memory is TINY. 8MB reported. You can save and load backups on the unit itself which is nice, and it reports as USB mass storage for management. There are only 3 sample slots, which are max 5 seconds/each, mono .wav at 16bit/28KHz. Honestly I use the audio in for sync rather than sampling — the two sample engines are interesting but I haven’t dug into them as much as I should (note to self…).
For presets: 127 memory slots, 50 custom 8bit waveform banks, 20 FM waveform banks. There’s a lot of button tapping to get around presets sometimes, unless you prepare ahead / send program changes.
The sequencer is simplistic but has a few cute tricks, so over the course of a song I’ll usually punch in and out of recording into it, letting it build and loop, and then clear it & start anew for another section or drop it back into arp mode. (Edit to add: Quirky but not intentionally obtuse.)
The interface reminds me of some of the more esoteric Nintendo DS games released for the Japanese domestic market only — I had an absolute ball with those when I lived there years ago so the interface, while quirky, feels weirdly nostalgic. It’s very much the end-product of a passion project. I’m probably not explaining it well, but it has a very distinct personality in its approach, like you get a direct insight into Dr. Yu Endo’s creative personality.
This is getting far too long and absolute unfocused so: I have come to quite like it as an adjacent instrument that brings what it wants to be to the music. Anything else specific you’d like to ask, go right ahead and I’ll try to stay on topic 