I figured I could add something to the conversation owning a pair of these for a year.
I find the fit to be good meaning true to size. I have a wide forefoot and high arch and I don't find the Terrex Cross SL to be too narrow across the forefoot or too restrictive at the top of the arch.
Comfort is really good and they are as stiff as my old Impact VXi.
Durability is pretty good with the photos below being taken today after riding these shoes exclusively for a year at 3-4 rides per week on a mix of Chromag Scarab, Stratline Defacto, and Spank Spikes.
While there is wear on the forefoot I don't feel that this has hurt anything as far as grip or comfort goes.
Would I buy again knowing what I know now?
The answer there would have to be 'yes'.