I agree. I find myself listening to them over and over. I especially like his commentary for HENRY V, which I'm glad to see that ITV ported over for their Blu-Ray.
I also have the Studio Canal Blu. My friend Bruce, who did the commentary, said that they worked on the master from Studio Canal, and improved it considerably, and that I would have to buy the Criterion because of that. But I doubt that it's improved to the extent that you need to buy it again...