I have several of the K&F Concept adapters for Nik(RF)-Nik(Z), which are very good. As virtually all my F-mount lenses are "chipped", I normally stick with the FTZ to get full advantage of the lens CPU. If I do find alternatives with pass-through contacts, I'll consider them as well.
The FTZ does feel a bit "clunky", but otherwise is very well built. I had hoped for a version without the tripod mount platform though as this sometimes interferes with handling.