I'll be up front and say it: Mountain Khakis aren't cheap.  Unlike many things, however, you get what you pay for.

First off, these things are bombproof.  I have similar pants from a number of other companies like the North Face, and none are as resilient as these.  My North Face Crag pants snagged on a desk corner and have a hole.  I wouldn't be surprised if these just destroyed the desk.  The flip side to this is that they are not the most plush-feeling pants you'll ever wear.  Don't hear me saying they're uncomfortable - they're not, and they are likely to get even more comfortable with wear - but if you're used to pants made of softer material there may be an adjustment.

Second, the fit is excellent.  Let me offer a caveat, however: if you're looking for skinny jeans, these will disappoint you.  These are pants tailored to look good while retaining their practicality.  In other words, they're built to move, not just look good.  There is room in the legs for your legs.  I should also say straight out that my legs take up more pant real estate than average: I'm built thick.  If you've got skinny legs, it's conceivable that you might swim in them.

Bottom line: they sell these pants as able to go from the boardroom to a rock face.  They're right.  And while they're at it, they make your posterior look quite nice indeed.