I ordered this set with much anticipation. I had Haas' earlier set on DG. There are some very fine solo readings there (still not up to Gieseking or Arrau levels, but great) as well as unique and superb readings of both of Ravel's piano concertos. (Two of the first, an early, bright, Gershwinesque performance and a more somber later take that I liked a lot more.) But most of those recordings were pre-stereo, and I hoped these would be as good or even better and also in superior sound. The sound is better, but not as good as sound from the late-60s, early-70s generally was. But even more disappointing were the performances. They are rather uninspired and sound labored at times. There's no joy in Les Collines D'Anacapri, for just one example, and no quiet mystery in Des Pas Sur La Neige. (I heard a live performance by Radu Lupu of this piece once that stopped time.) These sound read off the page rather than explored by the interpreter. The Ravel is similarly okay but not spectacular. Throughout there's little color, little imaginative use of pedal, and the dynamics are minimized (though honestly I have the same issue of minimized dynamics in her earlier set as well). There are many better, richer compilations of these oft-recorded works to be had out there.
Barely three stars. But her earlier DG set is recommended, as are readings by Gieseking (both sets), Arrau and (so far, just started exploring) Kocsis. Much ballyhooed Michelangeli and Uchida left me cold.