First, a warning: If you find wide use of tempo rubato to be a precious affectation, you're not going to like this recording. Watchorn has no reservations about the technique. I found it somewhat distracting myself, but I know that there are those who can't stand it even one little bit, especially in their Bach. They'll want to find another recording.
Second, another warning: If for whatever reason you dislike highly-ornamented performances, again, this album is not for you. Watchorn has no qualms about decorating right in the center of the room (for example, the confusingly-ornamented closing note of the c-minor fugue, which mars an otherwise crystalline performance).
But all that is a question of taste. This is an excellent recording of a virtuoso performance, even if it's not, to this listener's ears, the perfect gem the earlier reviews would indicate.