Ok Pierods, now I'm confused too.
The N90s would be no slower, it simply requires auto focus lenses that have an aperture ring if you want to shoot with manual exposure settings.
With the N90s and non"G" auto focus lenses you could:
2 focus with a half push of the shutter button using the right index finger
3 set aperture with your left hand that is already there supporting the lens
4 set time with your right thumb using the wheel
There is no extra step, nothing to slow you down.
The real advantage of cameras with two finger wheels is that you can use "G" lenses if you want.
Originally Posted by pierods
For what it's worth, I have the F5 and it's a dual wheeler camera. When I use it in manual mode, it's nice but IT IS SLOW in comparison to the F3HP. The wheels are good because they support smaller steps than the dial on the F3 but to change shutter speed from 1s to 1/125 it does take some time. So I don't think the N90 is slower than the N80, but they are different.