The Plasti-Dip is holding up great. I only have two problem areas - one where there is rust underneath (I sprayed right over the rust and its bubbling), and a small nick from a door ding I got two days after I sprayed it.
I took this picture today. Yes, its dirty. Since I sprayed it, I've only rinsed it with water once. Salt, snow, ice, rocks... nothing has been able to destroy it.
The link below is a big picture of the one above.
http://img19.imageshack.us/img19/3475/galantpdfeb13.jpg