I've got a lot of use on a pair of these pants. They were my 'go-to' pants for the last 2.5 years for hiking, biking, fishing etc.
Overall, I am happy with them. The fabric has proved to be quite durable, enough so that I opted for lighter weight pants for my next pair because I didn't think this much durability was really necessary. My new hiking pants are Patagonia Sol Patrol pants (~7oz rather than ~10oz).
These pants only received damage on two occasions:
1) A high speed mtn bike crash resulted in a small hole on one knee
2) A large (ie. pea sized) ember landed on my lap from a campfire and sorta half melted a small hole.
I still use these pants, but they are now my 'grubby' pants because they are showing their age. Most importantly, the stitching around the rear pocket is starting to come out.
The only two aspects of the design that I don't like are:
1) The integrated waist/belt system isn't so great. You've got a waist button, an elastic waist and a built in belt. This system is unnecessarily heavy, and the belt tends to slowly slip so you need to re-tighten it every hour or so while hiking. This is the worst attribute of these pants.
2) I don't like rear 'butt' pockets on hiking pants. I don't need them and they tend to see a lot of wear and it means you're sitting on a zipper everytime you sit down.
Overall, they are good durable pants at a reasonable weight, with a not so great waist system. It would probably be better to chop off the waist elastic and integrated belt and just use your own belt.