All manual nikon cameras are smaller, lighter and easyer to use than f4, f5, f6´s, look at fm and fm2, nikkormats and F, F2, F3 they will last longer than your children´s children, and simple fuss free objective controls are the best. You only lose some auto thinguies, that i really do not use. Battery´s are optional also... not for everyone although...
And there's the rub. I have semi-auto's OM10(x2) and OM2. They are light, have better prisms and an extremely great metering system. When I shoot slides, these are my goto. It helps that I have a couple of Carl Zeiss Jena lens. I have just not been won over by pre-f4 models, not that they are bad.
The big attraction with the F4 is that it is the 'everything' camera. Pre-AI,AI and AF lenses. The size was not a consideration (yes it is huge) because I had a pre-ai 50mm and a pre-ai 80-200 that I could only use on my F601 when I used an external meter. These are two extremely sharp lens.
I picked up the ratty F100 (well used) to be able to use a VR and G lens from my D200. It performs well, as expected.
So here comes the F6, only slightly heavier than the F100, tons lighter (OK, I exaggerate) than the F5, and can do my PRE-Ai lens because of it's metering system. It may just be enough to make my substantial OM collection go to a new owner. My yearning for a F4 has gone away.
I received my F6 today. I ran a roll of Foma 100 through it and reversal processed it. Incredibly perfect exposures. I tried out the data-imprinting between frames and I can see me getting addicted to that.