I shot the Z7x and the Heli twice side by side. The first was a bare bow which I have a hard time telling because of the vibration and noise inside. You hear the arrow hit the target thats about it. The feel I honestly felt the Heli had more vibration when I shot the two side by side the second time with sights and stabilizer on. I am in the same boat is you. I am dumping Bowtech and going Mathews and I really wanted a newest model. But I felt the Z7x felt far better when releasing the arrow. I loved the light HeliM but there was more recoil. Just sayin'. Looking for a good deal on Z7x and that's coming from a Bowtech user that has never owned a Mathews so I am not partial to any particular Mathews bow.
Bowtech General 29" #70
2005 HuntingNet Deer Bowhunting Champs
Lone Wolf Alpha Hang on Stands and Sticks