I'm a lurker and appreciate the generous sharing of experience I find here. I have to come to Marks' defense. I sent him, in January I think, a Nikon F4. Had it back in about 3 weeks working perfectly.
Maybe the issues are related to some machines needing hard to obtain parts/attention that only he can perform? I had 2 cameras I wanted serviced and he told me, up front, that the Nikon would be much quicker.