Change out your phillips bit when they look a little damaged, once they are a bit bent they will start camming out every time. Lean on the tool a little bit to keep it from camming out while driving phillips head deck screws. My wife can't seem to figure this out, strips every screw, hands the tool back to me and it works fine. Also, buy impact driver bits, not screwdriver bits, they are made of better steel and last longer. I use the DeWalt 5 packs, $3.94 at home depot.
The square drive or torx screws are probably better but cost more. I use phillips, like the coated deck screws that are made for treated lumber, the coating seems to lube the screw and make it easier to drive into wood. Bar soap or wax on the screw helps too.
Love love love my Makita impact driver. Bought the drill/driver/light/charger combo pack.