Pretty sure it also requires your BCM to be reprogrammed. Serge did this mod and pulled it back off because it never worked 100%, as Nathan said above. But I think Serge could shine a brighter light (pun) on the subject.
No BCM programming required. It works by switching to the LED harness but the DRLs won't work. If you want the DRLs to work there's a couple of ways to custom wire the harness to either have them work properly as a dim version of the low beam, or as I had done, for the DRL to be the low beams.
But that's not the reason I took them off ... I took them off because the driver's side kept getting unhinged from the height adjustment mechanism and would end up pointing straight to the ground. It happened with two straight brand new driver's side headlamps, and GM wasn't going to keep replacing them for free forever, so when I got the third one I sold the whole thing as a package rather than take a chance on another driver's side issue. Btw, there's no reason that I could think off that that one side kept failing, but it did.
Brent, those rims will look great.