I've used Elites customer service needed new draw length mods for my GTO they are some of the nicest most helpful people I have dealt with. I can't help you with the Z 28 but I do love my GTO and I will have a new GT500 or Z28 as soon as I get rid of my 101st airborne I like the bowtech but it is definetly not as smooth as the Elites I have shot, it is faster than my GTO but can't hang in the just feels good shooting category IMO.