I just finished it. M10, with mostly underpowered lvl 60 weapons. What a slog. The bosses took so long to kill, they were total bullet sponges. Worst of the 4 DLCs, but it wasn't terrible. My favorite part was probably the 3rd zone where you fight loaders a lot. It reminded me of BL2, so that's probably why I liked it. Now to get lvl 65 versions of my favorite weapons.