Both Nikon Z teleconverters work perfectly as advertised: They magnify the image of any (compatible) lens in front of them by 1.4x or 2.0x in exchange for a 1 or 2 stop slower focal ratio. They translate all EXIF data and retain every function of the mounted lens. In combination with the Z 70-200mm f2.8 VR S (the only compatible lens at the time of testing) they are much cheaper, smaller, and lighter than getting an additional hypothetical Z 98-280mm f4.0 VR S or Z 140-400mm f5.6 VR S lens and they give the mounted lens an extra boost in close-up capabilities. Optically the results from using the Z TC-1.4x are so good that you need not bother to take the teleconverter off when shooting at focal lengths of 200mm or shorter - which is important when you don't have time to swap the TC out during shooting. If you own or think of buying the Z 70-200mm f2.8 VR the new Z TC 1.4x is a recommended accessory. Regarding the Z TC 2.0x I'd rather wait: You'd probably need an excellent telephoto prime lens
to see the full potential which the TC-2.0x can deliver!
Again, the OP did not specify what Z lenses he had. But, as of this writing, the only compatible lens at this time is the Z 70-200 2.8 VR S. If he has another lens, it may not work.
Good luck and keep on shooting until the end. Even you oh king of Canon.