@Slash I have had for about 2 weeks and worn perhaps 8 times.
The fabric is heavy, it starts stiff and so far has softened a little but stayed strong. I can't really describe it; all the chinos I have are soft but these are robust.
I terms of sizing - there is little or no stretch in them so went a size up from denim because of that. I feel they are more comfortable now than 2 weeks ago so there must have been some give. The 777 fit meant at first they felt tight on the upper leg when sat down but not so much now.
Knees feel fine, they do stack a as others said.
Obviously they are great but I may try some of the other fits if / when they come in so I have something more laid back. On the other hand I may buy other colors in these.