If you use staffs frequenlty then you shoud get it. Otherwise if you like to use the spells alone then do not. I use staffs but i dont use them to much in order to get the perk since i prefer using spells alone. Also about the uncapper: The max i have gotten in a skill is 199. After it got there it stopped going up and also the number turned red. If you want to level up infinitly then make your skill tree legendary.