This is simply the best recording of the Chopin Etudes. Ever.
Pollini's percussive touch doesn't sing, Rubinstein didn't record them and Richter didn't record them all (pity!)! I remember this recording on LP, and recently bought it used here at Amazon.com.
Ashkenazy's later recording for Decca/London is perhaps more polished, but it is not as heartfelt as this. I have always appreciated Ashkenazy's art. He is a great pianist and musician.
Legend has it that he played the Etude in Thirds in his audition for Ania Sumbatian, his teacher at the Moscow Central Music School for musically gifted children at the age of ten. After listening to this recording, I believe it.
If this recording becomes available again used or new, pick it up. You'll be glad you did.