Thought I'd share some experiences on my recent Bach organ purchases.
First, I got volumes 9-16 of Weinberger
's cycle on cpo.
I'm very satisfied with it: good, honest and pointed playing - straight forward with no frills. I like that.
I found volume 13 with Clavier Übung less satisfactory in comparison with the rest.
Listening to these recordings confirmed the importance to me of the use of period organs - they all sound beautiful, some drop dead gorgeous! If this cycle is issued as a boxed set, I will most certainly get it!
My other purchase was the Clavier Übung III with Suzuki
This recording simply doesn't do it for me. Suzuki's playing is very flowing and that I liked. But in the end I find it all too abstract and detached, and too smooth - he plays a lot legato. Same goes for the choral intermissions: it all sounds very ethereal, but I don't hear the (spiritual) message - I like that concept of very much though! (Believe Koopman did the same on Teldec?)
Finally, the impression of smoothness is enhanced by the modern organ, which lacks IMO character and "grit".
Of the very little number of recordings I know, my favourite recording of Clavier Übung III remains Kay Johannsen