Have you listen to his recordings of Inventions and Sinfonias?
He is very provocative! He changes rythms as he wants , and tries to show the melodic side of these works .
There is a trick he uses a lot, I think it works for some pieces but not for others. He makes longer the first note in each bar . It is a kind of rubato, since he accelerates after then to recover the tempo. When you hear it the first time , it sounds weird (we are used to hear metronomically "perfect" Bach versions).
But if you hear these works as if you did not never heard them before, some performances are really beautiful, in my opinion. But you have to forget the score, any version you have already heard, everything. Just as if they were new pieces of a unknown composer.
When I was studying Sinfonia nº2 , I heard Rubsam performance and some others with my teacher, and without knowing their names before, he pointed to Gould and Rubsam as the ones he prefered. He did not like other versions as much because being uninteresting. I was surprised, because Rubsam version of sinfonia 2 does not "respect the score" (he uses the trick I described before).
You can hear one minute of each piece at Amazon. I really recommend to anyone studying inventions (but do not try to imitate him!).
However, I thank Naxos to dare to publish this CD.
Javier