I started with two pairs of the double knee utility pants, they have held up great in the last 6 months (I used to replace Carhartt double knees every 6 months). Anyway, there were a couple things I didn't like about them, not enough little pockets for things, the knife clip protection on the main pockets is too thick, the double knee holes for pads is too small, the inability to have ambidextrous hammer loops or pocket-watch pockets... All that to say they are durable as ****, they've just now broken in and I apprecciate them more and more everyday... and then 1620 comes out with the 2.0 fixing EVERY SINGLE ISSUE I HAD SECRETLY GRIPED ABOUT - they didn't ask me, I didn't complain to anyone, they just decided to make better pants than their pants that were already awesome.
In conclusion, the 1.0s are awesome, I'm wearing my 2.0s as I type this and I think I've decided on the pant company that I will stick with in my continued tough-as-**** pant buying needs.