From what I've seen of Walt's work in pictures online, and looking at the price of Cardinal House pipes, I think it's a safe bet that those are some of the highest value pipes on the market.
I haven't actually seen a good closeup of the inside of a Cardinal House button (those are tricky to shoot), but just looking at pictures like this: http://waltcannoy.com/wp-content/uploads/2017/02/Cardinal-House-Pipes-Munn-Bulldog-Handmade-Artisan-Briar-Pipe-by-Walt-Cannoy_4195.jpg
You can see that the shaping is clearly a cut above most other pipes in that price range.
Most of my British artisan pipes don't really excite in terms of the quality of the button. Nice blasts though and I do still appreciate the idea of oil treated Briar.
Ironically I've made a hobby out of cleaning up pipe buttons now, so if that's a fault I can compensate for myself then I still like to get cheaper pipes, or specially treated Briar from makers like Ashton (with full understanding that it may or may not have any significant impact on smoking quality).