It's a mixed bag, really. Some of the recordings are bona-fide classics (Lazar Berman's Annees de pelerinage, the Zimerman/Ozawa concerto/Totentanz disc, Arrau in the Verdi transcriptions, much of the Bolet material), some are interesting if non-canonical (Sinopoli in the symphonies, Zimerman's B minor sonata and late pieces), and some are very odd choices given the performances DG/Universal had in the vault (Ott's Transcendentals, Solti in some of the symphonic poems).
Overall, I think the set really scores in having 5 or 6 absolutely outstanding discs of mainstream Liszt allied to 6 discs giving good coverage of his rarely-performed/recorded choral works (Legend of St. Elizabeth, Missa choralis, Hungarian Coronation Mass, Missa solemnis, Via crucis and Cantico del sol di Francesco d'Assisi). So if that appearls, I'd go for it....I did when I saw it for sale for $60 CDN.