I don't shoot either of them a whole lot since my Rolleiflex K4B is my preferred poison, but neither my Arax 60 or my Pentacon Six TL have given me any problems since I had the windon fixed on my Pentacon.
I am pretty careful when I load the film and I don't let the wind on levers slap back because I have been told that the film transport was the weakest part of the cameras.
However, I do love those Zeiss lenses so I will likely hold onto both for awhile. Since I only have about 15 rolls of film through either camera that could obviously change quickly, maybe even the next roll. 😀