I haven't used Mar-K for stainless, but I did just buy a rear roll pan from them and the quality is excellent. Their customer service was good also and not even UPS could have damaged this piece the way it was packaged, complete in it's own wooden crate. On top of that, the price was right, so I would definitely buy from them again.
If they were in Texas instead of Oklahoma City, I'd drive down and visit Mr. G's at the same time...heheh.