i also agree with the back to black. you immediately see the results.
when i first used it, my trim, bumper, etc looked shinier than the day i bought it. and after a few weeks when i was washing it again i noticed i didn't even need it.
one warning, don't apply it to the step pads on your sidesteps (if you still have the stocks) as it will make it slippery and pretty much render it useless as a safe step.