I had an OP1 for about a decade and I don’t think it can be beat as a fun and flexible all in one box. Any tool has limitations, so if you dwell on what things can’t do, then good luck with that. Maybe a list of non-negotiable features and a list of ‘oh, that’d be cool’ would be useful.
The biggest reason I ended up selling mine after all that time, and after saying I never would, is that it didn’t play well with other instruments in the way I wanted it to. But I think I got a lot of great mileage out of it over that 10 years and I still think it’s an amazing and inspiring box.
As pointed out above, it’s FUN and that counts for a whole hell of a lot in the big picture. It will go down as one of the classic electronic music instruments of the last 25 years I think because it’s so fun and flexible. Also, as pointed out above, the price point has gotten to the point where I’d be less sure about buying one. When I bought mine for $800 or whatever shortly after it came out though, I felt like it was totally worth it.
There aren’t many tools that are as timeless as the OP1.