Actually turned out quite well, I was pleasantly surprised. And... They were done in under 2 1/2 hours. I guess the only downside I could find, was that there were a couple of pockets of fat that didn't render which normally would have.
And these were Hormel "enhanced" ribs that I normally don't like, but they were on sale at the local grocer for a really good price. I'll have to try this hot 'n fast stuff again to make sure it wasn't a fluke. Maybe try 325 next time to see if I can get that fat to render a little better.