Claying is so worth the work, your paint ends up so smooth, it's crazy. I'm telling you guys, spend the $80 or so and get the Zaino kit that includes everything you need and you will not go back. It's so easy to do now too that they have the accelerator additive.
A freshly clayed black vehicle is impossible to beat, but keeping them that way is tough. I was telling my wife last night, as I was washing her LS, that I feel like it's my part time job to keep my black Z71 and her LS clean. And I'm too much of a freak to just let them get dirty. Oh well, it's worth it.