On the contrary (though this is no slight at @Heyes who is one of my forum favorites)
I’ve had hands on 4 OP-1F’s all with no issues, except one had one of the plastic knobs with a hairline crack in it. Something I think is a bummer sure but also not noticeable and easily fixable with a replacement set.
As @Heyes mentioned, I do think TE will help you with issues, I’ve got no complaints with them. I’ve had issues with other equipment too and tbh dealing with TE felt like dealing with people not a massive company (elektron too, they’re great and their devices have issues too sometimes!)
So far I feel that OP-1F’s build quality has been very good, and the reports of issues seem muuuch fewer than the Op-Z which has multiple well-documented frequent issues.
I’ve had multiple op-z’s too and the encoders have popped out, the units have bent, certain modules just didn’t work (both Oplab and line), I’ve had audio output crackling issues, double triggers and the pesky and somewhat useless pitch bend thing seemed to have a problem on each of the units I’ve had.
That said: not all of the units had the encoder issue, but the ones that did I was able to fix.
Using Deoxit helped clear up the double triggers.
The bend some have remedied with better support in the middle. The pitch bend thing doesn’t really matter since it can’t be recorded anyway (live only).
I think the OP-Z is a tremendous value
I doubt the release will be a OP-Z field, or mkii, but I would absolutely love it. At the end of the day, I picked one up new, on sale for very cheap (and I had points at that retailer) so it ran me $300-350 I can’t remember,
If you can get a killer deal on a new one, or make sure you get a return policy on a used one then I see very little risk in paying sub-$400 for this device even with the issues. It’s absolutely amazing value for money.
The op-z was the first piece of music hardware I ever had outside of a bass and piano keyboards and it shaped a lot of how I like to make music now. In some ways I’ve grown out of the internal sounds and generally have gravitated towards using the OP-1F, but that happened over time. I’d absolutely recommend that you check it as a good starting point to the brand.
As for the midi implementation you mentioned “from Z to OP-1F” care to elaborate on what you mean/ what you’re looking for?
The midi ‘implementation’ works exactly how I’d expect the two to work after actually having both and understanding how they work. Both via Bluetooth midi as well as audio/midi over usb-c. There is nothing in this communication between the two that I’ve felt is lacking, so I’m curious what you’re looking for?