Just bought a 2016 Tahoe LTZ with the magna set-up and they were leaking badly and terrible ride. This is at 135K miles so I expected some issues. Did some research along with a parts dealer helping me and bought a replacement kit from Parts Geek for $264. This included normal front struts/shocks and rear normal shocks AND the needed resistors. It rides like a new vehicle now. Did have one issue which was the wrong resistor was sent thus leaving the suspension error on . Called the company (Unity AP) direct and talked to a tech guy who said they had noted that the kit contained 6ohm resistors and should have contained 3ohm and 6 ohm because the front requires less resistance then the back or the other way around- can't remember which. They are sending me the replacements free of charge.
Hope this helps someone.