Surprisingly the quad - mix - to - stereo sounds very much like good vinyl copy. Not vinyl exactly of course , but from all my many different cd versions of this album , i found this one sounds way more natural [70's way of natural], full [all the musicians in front of you , every instrument and voice - the whole 9 yards] and Deep Purple - like [if you wish].
I liked it so much , it took me unusual 7 or 8 times in a raw to listen the whole album from start to finish before I reluctantly decided to switch to something else.