okay testers who have compared them side by side- what's the verdict? If you had a full vial of ZFX (which I do)- would you wait and buy RDF or simply buy a bottle of Z5Pro- which will last me for years? I have a black G35 if that helps. Any feedback is appreciated. I definitely want to try out the RDF trim and tire product but I'm just not sure if the sealant is worth a switch from Zaino yet.