Paint removal

I haven't used one of those, but I have stripped paint to the metal with discs like the gray one on the left in the pic. I bought them at Home Depot, and they fit on a 4" grinder. They were about $7 each in 2005, when I did it, and it took about one per panel. The tool above looks like it would work better, but I'd check on the price of replacement stripper drums before pulling the trigger on it. The stiff scratchy discs won't put heat in the panels like sanding discs on a big grinder.