Over the past year (going back to August 2007):
Chrome FM2 that was bought as a project. Didn't realize that one of the blades on the lower shutter curtain was hosed. Sold to repair shop as parts. Purchased in July of this year, sold about 3 days later
Two bodies I purchased recently were functional, but had/have issues. The F3P needed to have the aperture follower cleaned, and needs to have the PC socket tightened down, as well as the F3-specific accessory shoe rewired, so it works. Luckily, the hot shoe on the DE-5 prism works, and the PC socket also works. The other body is my black FM2n. Well-used, so, some issues may be expected. Meter is somewhere between 1/2 a stop and 3/4 of a stop off. Varies. Luckily, there's no meter display twitch in the 1/15 and 1/30 shutter speed range. The FM2n is currently in for refoaming and to have the meter recalibrated to spec. Once it's out, the F3P will go in for the aforementioned issues with it. F3P arrived in June, FM2n last month.
Had a few Nikkormat FT2's with meter issues earlier this year. One essentially had a dead meter, another had a meter that worked, but that was a full stop or so off. The third was metering as if it was calibrated for the PX675 mercury batteries. Smooth action, though. It did also have a shutter speed indicator that was showing 1/1000 when the shutter was set for 1/500. Fourth was brassy, metering @ 2 stops off, but worked fine otherwise. Luckily, I didn't pay much for them. Also had a near mint looking black FTn that had a somewhat jumpy meter that was off about a stop or two, shutter speed indicator that was all over the place, finally disappearing somewhere in the body. Also paid very little for it. Had a couple chrome FTn's with corroded battery compartments that worked, but had jumpy meters. Also had one that worked fine, just didn't care for it for some reason. Mainly bought it for the 50f1.4 Nikkor-SC, which had been AI'd, but was covered in fungus. Used the AI ring for a non-AI 50f1.4 that I had lying around.
I've had a couple F's with dead slow speeds. A chrome 70xxxxx body, and a black 65xxxxx body. The black body donated its FTn finder to my current F, which is mechanically fine, but cosmetically challenged.
Had an F3 eyelevel that I got for $15.00. Needed to have some serious work done. Donated it to a repair shop, walked away, after pilfering my prized P screen out of it. Another F3 eyelevel with twitchy meter problems - returned to repair shop.
Black FM2n that was a freebie. Worked fine, but couldn't be mounted to a tripod or be used with a motor drive. Casting was broken. Had a shop rebuild it using another casting, then sold it off.
F5 body, well-used. Purchased for $325. Half of the LCD was faded. Correct exposure was obtained when the meter display didn't show when in manual mode. Returned and exchanged for an F4s with MF-23.
Another black FM2n for $35. Twitchy meter, plus dent, and missing a couple parts. Replaced the missing parts, and used it. Sold it to buy back my F FTn.
Black FE2. Purchased as dead camera. Found that winding mechanism was jamming. Was able to unjam it and make it work, but had purchased it for parts, for the FM2n mentioned directly above. Sold for $30, along with 50f1.8 Series E that had massive fungus growth.
Chrome FG-20. Received with above 50f1.8 Series E. Donated to used camera shop (then thrown on eBait as parts camera), after shutter was proven to be iffy.
Chrome FE. Paid $25, due to massive dent in prism, and supposedly dead hot shoe. Hot shoe worked when I got it home. Replaced top cover with decent part, then sold camera for $40.
-J