I was wrong this morning, you were right. I just listened to the Orgelbuchlein. I like the registrations on the Metzler. The voicing is lively. I like the strong sense of movement forward, there's a feeling of spontaneous and sincere expression of deep things, it made me think of Jens Christensen's Art of Fugue. What I said in 2013 about "celebrating God" or something doesn't really do it justice: it's spookier than that. The sound quality is excellent given the period of the recording.
To some extent I'm such a sucker for Orgelbuchlein that I could be exaggerating, in fact I'm sure I am exaggerating.
And my 'problem' is, that I do not listen enough to the Orgelbüchlein... I always seem to go for the 'Organ Mass', the Leipziger Choräle
and Die Kunst der Fuge
Added to another 'problem': after some five years of monomaniac organ listening (mainly Bach), I have turned to other instruments the last couple of years, and to other ensembles and composers, too.
It's almost a suprise for myself that I ended up again in this everlasting thread.
Anway, here's wishing you a happy new year with all the Büchleins, Heillers, Christensens and all other great music and its performers!