I have yet to hear an harpsichordist who can top the Harvard boy (Ralph Kirkpatrick). Of course, that is only my opinion, but that is what Amazon is asking for.
Nonetheless, there are a handful of tracks where I think Gustav rivals Ralph.
It's a shame that each Prelude & Fugue aren't on separate tracks (I mostly prefer only one or the other), but two pieces per track aren't that hard to separate.
It's quite amazing what Bach did - to compose such beautiful and/or profound miniatures for every key, and in the older, early-Baroque counterpoint-style of his predecessors (unlike the then "modern" late-Baroque style of Handel & Telemann who were prefiguring the soon-to-arrive boring Classical Period I-IV-V compositions.
If you have an ear for detail, and love Early Music, this is a good buy. It's a great shame that Deutsche Grammophon won't put Ralph Kirkpatrick's performance on CD (I still have their vinyl release). (Deutsche Grammophon have put Dr. Kirkpatrick's Clavier performance of this work on CD, but the Clavier is far inferior to the harpsichord in richness of sound.)
[It occurs to me that I've reviewed this before, but I'm not sure, and Amazon have asked me for a review just recently. Could it be a bug in their software?)