I have two N90S's and an F100. I remain torn between the two. The F100 is ergonomically superior, with a far more comfortable grip. However, it is also quite a bit lighter in weight than the N90s, and when using a big heavy lens the greater weight of the N90S provides better balance. With my 80 - 200 mm lens, the F100 feels somewhat front heavy. All that said, I also have an F4, which I love, but using it now seems like a workout compared to either of the other models. If anyone would like to trade an F100 in good condition for the F4 or one of the N90S's, please contact me. I'm not getting any younger, and I fear one day I'll join the heathens shooting with cell phones, just due to the weight of my equipment.