ok, here it is, i have shot the Z28, i have owned the GT500, and currently own the GTO, the Z28 is by far the smoothest binary cam bow out there, it is and i quote smoother than my brothers DXT, really nice valley and a solid wall, lets put it all together , hummmmmmm 32 inch A to A , 336 IBO, and an 8 in BH, ultra smooth and quiet no hand shock , if you want more info , dont put down there website, go to Archerytalk and ask this question , or go to the Elite website and get on there forum and ask around.