I am a civilian aviation mechanic for the U.S. Navy and have owned 3 pairs of these, and they are truly outstanding boots. Though I can't wear them on the ship because of the sole, at home these boots are truly amazing.
I crawl over and under jets, on my feet for 8 hours, and these things hold up really well. For my line of work they last the longest and really hold their own. They last a little over a year for me, and that's a compliment compared to the other brands I have tried.
The only thing I would change about these is make them waterproof. But if it lowers the comfort level and the durability leave them be