These Are good perks, but not game breaking imo. I snipe a lot and found that armor piercing/shooting through cover is often not reliable, this video is in so far not a good representation of the blindfire killquote you normally get, since you will also miss a lot. Especially in PvP you are better off with 100% stability, a large clipsize and high firerate. If any Sniper might be considered OP in this game its the Revenge, with its default Perks.