I just purchased an F100 and it feels pretty solid. I did some research prior to purchasing it and read mixed reviews. I plan to keep it no matter what, but I would like to know from other F100 users out there what to watch out for. In other words, what limits can I push this camera to without damaging it, etc. Several reviews out there indicate that the film rewind mechanism is plastic and will not last long. Apparently newer models have replaced the weaker plastic parts for different plastic parts. There are also reports of the plastic camera back not sealing properly thereby letting dust into the film chamber. Also, the lens mount is supposed to be brass instead of stainless steel, so it might not withstand multiple lens changing for very long. I have also read that the F100 is sealed well, has great AF capabilities, and is a rugged camera. Again, I plan to keep this F100 and use it regularly. Has anyone had any negative issues with their F100? Is there a certain amount of times you can insert film before the plastic parts give out? Has anyone really had any trouble with the weaker lens mount? Is there anyone out there that has been using an F100 for several years without a problem, loaded hundreds of film cartridges through it?