By the way, I ran with this might stacking build last night and was absolutely dominant. I think I died 2-3 times in a handful of games and that was because I ended up getting downed by a mob. Won two 2v1s and even held off a 3v1 until help could arrive. Like I said earlier, love me some bomb kit with condition damage.
I've ran both the bomb kit + tool kit combo and the might stacking build you linked. I found, with my gear setup, the might stacking one does more damage, however both are good. Bomb kit is good when you feel like running with the zerg sometimes, but coated bullets also does a good job with tagging enemies.