Forgot you also wanted experiences from other users. I've owned an N90s forever it seems like, pretty much just a couple of months after they hit the market. It finally started to get the sticky back, and the mirror had turned some sort of brown color from not being used in a while.
So I figured it was time to update it, and went with the F100. It's basically 95% F5, but in a smaller package. It too had the sticky back, but it was much easier to deal with than the N90s.
It handles better, has better AF, and the flash unit for it can be had for a decent amount. Even has built-in diopter correction in the viewfinder.
As for Canon AF gear, I don't own any. Just some manual focus lenses, and appropriate bodies for them (FL/FT QL, FD/ FTbn and AE-1 Program, and FDn/T50-70-90). I really do like the Canon glass, but not enough to do a total switch over from Nikon.
For the Nikon AF, I have three Tamron zooms I like. Always have had good results with them. Just started to get some Nikon AF primes, so not much to tell there.
PF