I have not, going to do my semi-annual polish fest at the end of this month. Going to do full paint correction and CQuartz on both my wife's car and mine. What do you mean by 4x4 strips? Are you talking about the 4" microfiber suede applicators? I bought this kit:
http://www.carpro-us.com/cquartz-30ml-kit/ back on Black Friday, besides a couple more Yellow Fellows and the 10 pack of large microfiber suede towels anything else I should pick up in my order?
I already have IronX, claying products, polishes/pads, and Eraser. I'm currently rocking Wolf's Body Wrap on my Camaro and Adam's Quick Sealant on my wife's car so I think all of that should do the trick to have a clean surface for the CQuartz.