Do parachutes help when you lose control 50ft off the ground? Deploy time is probably too short. Also lateral speed may be fatal enough with a jetpack.
Still needs a certain minimum height to be effective, >= 400 ft in straight and level flight, 920 ft in a spin [1]. Don't think it would be much use in a jetpack (apart from the fact that the article states that they haven't found a way yet to attach both a jetpack and a parachute, let alone a ballistic one).
