I have listened to some of Beethoven in the Temperaments, but not the other. Beethoven in the Temperments has an interesting and thorough discussion of temperments by Ed Foote, who contributes to the PTG list. I can take or leave temperments - and when I play I much prefer ET. But then I don't have any trouble hearing different "color" in different keys even with equal beating between notes. But that is a different discussion \:\)

As to the performance, I would counter with the Wilhelm Backhaus cycle of Beethoven Sonatas as my current favorite. They are stylistic, engaging, energetic, thought out, and have some of the best concept of line and architecture that I have heard in these. Not to mention that Bachhaus had a phenominal technique to pull it off (unlike Schnabel). Backhaus studied with d'Albert, who studied with Czerny, who studied with Beethoven...

Ryan