The reed response is at an absolute optimum. The inside of the bass box is built so that as much of the wood the accordion's made of gets the sound of the reeds (for starters, the bass box is wider, the valves are as thin as a sugar cookie). Point being, there's more of the wood exposed. The dimensions of the bass/chord "rooms" (for lack of a better term) are not the same size. I'll take a pic to clarify....

The treble reedblocks are a different strain of maple than he used to usd. It is white as a ghost. He is also shaping the stop slide holes differently than he used to. I realize how controversial this may sound to you, but on the site he mentions "precision with the switching mechanism".

These are my observations. All I know is that he makes those reeds respond better and faster than any accordion I've ever played. This, to me, is why it's the best. It almost plays itself, sounds great and is loud, but not tooo loud.