This set is revelatory. Just listen to the famous Adagietto from the Fifth. How bloated and pretentious Bernstein sounds beside it. Only Barbirolli and Walter match the level of intensity of Solti, and his has the supreme advantage of the Chicago Symphony at its peak of perfection. I am beginning to think after listening to this, the Brahms and the Beethoven cycles, that under Solti they might well have been the finest orchestra ever, and that includes the Berlin band.
Indeed,the playing in every symphony is little short of miraculous and as for the interpretations they rescue this composer from an undeserved reputation as a self-indugent neurotic.
Whatever other versions of the complete symphonies you possess (I have Rattle and Neumann) Solti's cycle is unique in its elemental power and unsurpassed in terms of playing.