back to the actual subject of this thread (Barere): I've heard more than 3 cds worth of his playing, and here is my assessment of his good and bad points:
SOME BAD POINTS
-he often slows down noticeably from his gazelle-on-steroids tempos when the piece gets technically harder (e.g. octave bit in coda of Chopin 4th ballade; thirds passages in Schumann toccata and in Don Juan Fantasy). Despite what piano teachers tell us, I think it's ok to slow down when the going gets hard if the result is a musically justifiable satisfactory rubato effect or is not noticeable, but he doesn't always manage to conceal the slow-down in this way.
-inaccurate octaves (maybe he had small hands; I would be curious to see what he does with his LIszt Funerailles, has anybody heard it?)
-I think some of his encore pieces (notably his Weber perpetual motion sonata movement) furnish us with paradigm cases of some dude trying to play as fast as possible without bothering to be musical.
SOME GOOD POINTS
His fast pasages sometimes send shivers up my spine in a way that the same passages played by people with an infallible technique like Argerich or Hamelin do not. I think part of this may have a fairly boring explanation: he is plays at the maximum tempo he can (almost) manage, and gets some wrong notes in there. (Horowitz said he deliberately played wrong notes in certain passages. This could be just an excuse for unintended mistakes, but I agree that mistakes can help, when used carefully.) This hair-raising quality is part of what helps him to make some of his interpretations sound so 'demonic' (sorry to use this clichéed term, but I can't find a better word). Listen to say Liszt sonata or his Chopin 1st and 4th ballades. Each of these recordings have brought tears to my eyes at least once, which doesn't often happen. I still find the buildup in the 4th ballade overwhelming (there is some grasp of structure in there as well as brute technique; this is not the only way to play this piece -I like Zimmermann just as much- but it's worth checking this version out). The end of the coda to the 1st ballade on APR sounds ferocious, like a musical depiction of the destruction of the WTC.
It's a pity the sound quality of the recordings was so bad, but from what I can hear he had a beautiful singing tone (e.g. Blumenfeld left hand study).
And if he's meant to be a showman, then he shouldn't be playing things like Beethoven op 90 & op 110, Godowsky Renaissance and the Chromatic Fantasy.
OVERALL ASSESSMENT
Looking on the net, opinions of him range from 'superficial and messy speed demon' to 'one of the top five in the 20th century', but surely he's somewhere in between. His Blumenfeld Etude was technically and musically great (but Hamelin's is even better), his Liszt sonata is alternately spine-chilling and beautiful (but his octaves let him down, so that he can't match Argerich's hysterical recitative section and he even fluffs the passage that apr put on the album cover), his Schumann toccata is awesome (but Horowitz and even Pogorelich were better musically). His volume 3 apr cd (Liszt sonata etc.) is one of my favorite live cd's, but looking at his weak points, you can see why people might have been justified in at least contemplating leaving him out of the Phillips Great Pianists series.