everything they have is excellent quality. Even the black pepper tastes better
So Penzey's spices are indeed fresher and more flavorful than say McCormick, however there is some disagreement whether they sell the freshest and most flavorful.
The story has to do with the father starting a small time spice business, the son (Bill) expanding it into a national chain, and another family member (possibly Bill's brother) eventually breaking off in nasty split. He goes off on his own to go back to being a small time spice merchant who can have better control over quality and freshness, something he felt he could only do without the constraints of the larger business.
With that said, are there any downsides to using Penzey's spices since, according to this other guy, they aren't the best they can be? IMO, no.
1) having a store locally means I can pick up any amount of any spice instantly
2) despite any freshness issues, their spices are still strong enough that most recipe quantities need to be adjusted down
I mention this story because for as great as Penzey's is as a resource, there's still people out there who put it down.