I've heard nothing but good things about Zamberlan and their durability. I switched from Solomon to Vasque recently and while Solomon were decent build quality, two years is all I could get out of them since I Portage a backpack heavy loads often. The Vasque have been incredible and after over 200km of heavy rugged use are still in VERY good shape. If the Vasque don't live up to the 4-5 years I'm hoping to get out of them I might have to try Zamberlan.

Edit* I also make sure to only purchase full grain leather boots as they are always the most durable it seems!