Never used one in a Nikon as I prefer the 140 to the 200 as the flash is higher and less prone to over exposure and red eye. But I use the 140 mostly on my G2. For my Contax SLRs I use the 20 or 30. Since the 200 has no sensor itself like the 30 has I cannot imagine it firing at anything but full. And being a light so low you might run into same issue many Contax users complain of.
With so many classic Nikon flashes going so cheaply at KEH and you get TTL why use the Contax TLA200?