bought it today, new, from a store
I've only been playing with it for 45 mins, haven't read the manual but it's fucking incredible
Cool as fuck man, enjoy :)
The manual is worth a read though as a few things require the shift button for extra functionality. Basic things like holding down record will pause the tape until you hit a key to start a sequence, which allows easy sync recording, isn't obvious at first. The TE School videos are good too and they aren't too long. Nicely split into sections aswell, tape, sampler, fx etc
Preset handling on the op-1 itself is a bit clunky as you can't rename them on the device, only on a computer. That takes a little getting used to but I'd say it's an easy synth/mini workstation to learn. Oh yeah the drum envelopes are weird aswell :)
May I recommend the sketch sequencer for drums - you can get it to display a grid overlay to help get hits on time where needed and then add fills/ghost notes etc anywhere in between. Pressing a key will move the sketch point to the y-axis position of the relevant sound and then sketch along to x-axis to retrigger the sound. It's polyphonic obviously but no velocity so you need to have quieter samples mapped if you want accents.
You probably already know but for some reason sketch sequences of comedy male genitalia bare very little in the way of meaningful audio but they still look magnificent on that oled screen and maybe justifies their creation....