Interesting thing about dips is that I have an old Westside Bench video with George Halbert (lotsa hair) doing quarter dips with a training partner. They have wheels strapped to them but they only do the top few inches of the dip (lockout portion). I havent seen any powerlifters mention dips lately I think that it is because dips can stress out the delts if they are done in a full range of motion. Also I dont know iuf dips are needed really to build the triceps when there is such a large amount of tricep ecercises to choose from including close grip bp, board, tri ext, etc....