I've been using the 2001 stuff for a couple of years and it lasts for a good year on my two Jeeps.The water is still beading after a hard season of winter,moose hunting,sun,rain etc.I just clay-bared the Cherokee and applied F21 on it last week.The other Jeep (Wrangler) I just waxed it with the F21.Shine looks great on both and we'll have to wait till next year to see how the durability fairs over the year.If the F21 is a good as the 2001 then I'll be happy!I think it has to do alot with the factory paint quality.Chrysler paint jobs on newer (2000-up)vehicles have good paint IMO.Even my friends 93 Jeep Grand Cherokee's original paint looks pretty good,and he does nothing to that vehicle.