For a while I thought my first Drake stained easily, espcially around the waterline. I tried everything except a pumice stick, but nothing seemed to help. I've come to the conclusion that it's a light problem. The design of the bowl generates a shadow in the waterline area, and in the low light of our bathrooms, it looks like a stain. Shining a 500W shop light into the bowl makes it go away, but that's not a permanent solution.
As for individual poop stains, I've only seen one that didn't go away during the flush. I can live with that.