Some exercises are hard to perform initially and some of them can be made harder by the advanced user. One should not sacrifice movement and form because of the difficulty. The Dip Cradle prevents wayward motion of weights while performing rigorous exercises like weighted dips, pull-ups and chin-ups.
Momentum can sometimes make an exercise easier but in this case it can make it dangerous. Preventing momentum will allow you to use a safe motion while performing your exercises with the Dip Cradle.