I've had no issues with Fotodiox Pro adapters on my M240. I have them in Nikon, Minolta MD, M42 and LTM versions.
On my Z7 I use Kipon adapters, pretty much because those were available at the time I got them and they are superbly made. Nicer than the Fotodiox (but pricier), but they all work the same.
What it comes down to is if you get a bad one, send it back.