Yeah, I put white Rustoleum on with a roller. Ton of work and I didn't have much time because I was taking the 77 280z down to California for the winter. Lots of orange peel and you can see the roller marks in lots of places. Tough though. I have some rock chips, but I drive on gravel oil lease roads a lot, one of the reasons I like Rustoleum, easy to re-do the paint.
This summer I plan to buy a paint gun and follow some of the advice in this thread...like thinning out 2-3 to 1 paint. I put it on thicker, big mistake. I also bought an orbital sander and will use that with 2000 or 3000 grit.
Painting with Rustoleum was a LOT of work, and I'm always pressed for time, but I'd do it again...and plan to this summer!!