Are the Assist Devices for CPR Effectively Better or Worse?

i want to ask your opinion on the assist devices for c p r, li the lucas, or the auto pulse. How do you feel about em? Just, i personally like them ive. I trialed some of them when they were early in the field. Eme have some in our e m s agencies use them regularly. Some do not. And i know that some of the datais is not crystal clear about are they better or worse? Ino: "I would love to do another talk"