Depends on what you are anchoring to.....mud, rock, sand, etc., different types hold better in different situations. Personally, I had one of the rubber coated mushroom type for my 929 and can't remember ever using it. Use the wrong kind in rock and be prepared to cut you anchor line to get loose. Mine was mainly for emergency purposes. Also read up on how much rope to attach. I liked the rubber coated because it wouldn't chew up my compartment carpet in rough water. Also consider storing it on a cushon or old lifejacket to keep it from bouncing around.