Hi mmro,
I am a great admirer of Aarau, but forget my views - the following review of his complete Beethoven Sonata recording on the Philips label will give you my answer:
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Arrau's 1960's Complete Beethoven Piano Sonata Cycle is amongst the best and most enduring recordings projects ever undertaken by Arrau, alongside his Complete Beethoven Piano Sonata Urtext Edition, based on the original manuscripts, published in Frankfurt by C.F. Peters in the 1970s.
Arrau's entire 1960s cycle of Beethoven sonata recordings not only compete superbly with the very best interpretations, but has simply become indispensable.
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