First bear in mind that I'm coming at it from the perspective of an 'analogue' country blues folkster whose grasp of music tech is pretty much pre-millennial! - (I've only recently got my head around my Zoom 9000 although to be fair it sat in a drawer for 20 years 'til I picked up the guitar again).
The OP-1 is the gateway drug into making music that I've always enjoyed but also resisted (I have enough tech in my life already). A lot of its reviews/forums say the OP-1's not for beginners, citing its 'limitations' and unconventional workflow. But then if it's too wierd for beginners and too limited for pros then who is it for and why does it have such a cult following?
Well, I can liken it to another fine piece of 90's tech, my old Psion Series3.
This too had 'limited' functions but I had more fun exploring the the limits of its capabilities (slouched on my bed, half watching MTV Europe, on the bus, plane, lunchbreaks) than I ever would have made time for sat at a desk in front of a 12" CRT and Windows 3.1 (besides, that was DOOM! time!) Consequently I was able to create on that Psion what remain to this day some of my most sophisticated and complex spreadsheets ever; The Psion's limitations focussed ones attention into mastering the functions that really mattered most - plus I could do it whenever I liked and wherever I was most chilled out and relaxed!
This is what I feel the OP-1 gives me - This single tiny integrated unit delivers a physical (basic midi) keyboard, multiple synth engines, a drum machine, sequencer, sampler, 4 track recorder, and plenty enough filters and effects to keep ME happilly occupied. I don't have to waste months of my life GASsing over countless gear reviews, wondering which features might actually be useful to me and which are marketting hype. plus I don't have to fill a significant part of my home with a spaghetti of cables, keyboards and synth modules...
At my 'music production' level this thing promises to be unbelievably liberating.
There's such a wealth of gear now its really overwhelming
Perversely, overwhelm is exactly what I've squandered(?) my wealth on the OP1 to avoid! - The OP cost twice as much £€$ as I reasonably could afford but half the current OP-1 retail price - I make music for fun not as a profession I and really can't be arsed with all the mainstram pro gear. If it's anything like the photo industry, much of the stuff is unneccessary, over-marketed peripheral faff anyway. In fact photo gear might be a good analogy - In synth terms the OP's perhaps like a rather good pocket camera as opposed to a camera bag full of pro-gear. When I take photos with my old Fuji x10 I feel like I'm 'off duty' and making chilled out relaxed pics for fun - I'm in a different headspace to when I'm 'working'.
The article linked below is what made me think that just maybe an OP-1 could just justify the expense. However it was only when I saw Jean Michelle Jarre list it in his top ten favourite synths that I actually felt compelled to dispense with prudence and buy into the Teenage Engineering cult...
"It's Not A Toy" ; "It Goes Deep..." ; "Seller's regret; I bought it again!" - they're all mantras of the OP-1 way - Maybe it is best to steer clear...
https://audionewsroom.net/2015/06/rediscoveries-te-op-1-creative-block-limitations-other-stories.html