Yes, ziebart is still around. I had them do my proton late last year.

I only had 550 miles on it at the time, but they still gave it the used car rustproof warranty. I paid around 300 for undercoat and inside the panels. I've seen a lot of pics of vx's with rusty frames (even southern/western states) and wanted to minimize any problems. It also helps deaden road noise.