What he said. I tried several lengths (90,100,110), settled on the 90mm, felt right then and now, eye/handlebar/hub colinearity i(common wisdom, really just a starting point, like KOPS) is good. If I replace it, after having the bike now for a couple of years and some 11000 miles (I'm a bit more flexible in the riding position), I'll try a 100 just to see if that feels better. Or I may flip the 90, or I may not :-) . No pain, no aches from century length rides, either.

Also, a fitting is just a snapshot of your body geometry at a specific point in time. I bet most folks don't ride or stretch for a while before getting fitted; bet there'd be some minor differences if they did. Different stressors on the body in the store v. on the road, etc.

In my case, I've moved the saddle up just a tad (about 4mm) (which also moves it back a bit) from the fitting position and I'm quite happy.

The one change I've made I'm rethinking is, of all things, thicker bar tape, just doesn't quite feel right (probably something about the grip around the bar sending a subtly different position signal to the 'ole noggin), may rewrap in the older brand.

Just record everything, both from the fitting, and any changes in setup so you can return to a known position.