I was worried as many reviewers claimed they were slightly worse than real Model Ms but I have to say, I think they got everything down. (I've used an SSK and Lexmark Model M for reference.)
Hasn't the tooling at the factory worn down to the point where you can't get but crap build quality on those Unicomps? Or have they updated the tooling?
They updated the tooling in 2020 for the "new M" keyboards. One in the classic layout and one modeled after the original space saver keyboard (which Unicomp never had the tooling for).