I love all my arborwear pants, I have 2 of their "originals" 1 pair of their originals with flannel lining (not to be work above 40*), my first pair was their "light duty" pants, super comfortable, well broken in now, almost thread bear. I wouldnt recommend them for serious work, but they are comfortable.
I raelly like my filson single tins, and want a pair of double tin, I just wish they had more pockets. I think my next big investment will be a pair of fjallraven vidda pro pants. I wish arborwear would come out with a waxed cotton pant with a larger side pocket, I have always had excellent luck with their stuff.
I have a pair of firehose pants and hate them. the over sized cargo pockets that are on the front of the legs just make them too uncomfortable to wear, and I feel like I am trying to walk through the material with every step.