The real gems of this disk are the Chorale Prelude transcriptions. Demidenko plays these pieces beautifully, especially Durch Adams fall ist ganz verdebt and Jesus Christus Unser Heiland. One can really appreciate the beautiful sound of the Fazioli piano in these pieces in particular. My one reservation about the chorale preludes is 'Watchet Auf'. The only recording I know of that does this justice is Angela Hewitt's recording of Bach Arrangements(Kempff also doesn't do a bad job of this). The playing doesn't quite convey the spirit of this piece.
Demidenko also does a particularly good job of the Fantasia and the Chacconne, although some might find the Chaconne a little too slow for their liking. However don't get the wrong impression, Demidenko can break into great moments of power and speed. This is Demidenko's late romantic playing at its best.
He also gives a good account of the Prelude and Fugue BWV 532, although its not up to Gilels account of the same piece. Gilels manages to create a beutiful organ like sonority from the piano, and gets the tempo just right in each part. However Demidenko's faster fugue makes for a barnstorming interpretation.
I recommend this disc highly, as I said especially for the exceptional playing of the chorale preludes, and also the Fantasia and Chaconne. My one reservation regarding this disc is the sound. The tone could be a little fuller (perhaps the piano needed to be closer to the mike?) which is unfortunate because Demidenko is using a beutiful Fazioli piano. Don't let put you off though, because the recording quality is still superb.