This set is a real bargain, and self-recommending. The performances make for an interesting contrast with Blomstedt's later Nielsen cycle with the San Francisco orchestra. Those are slicker, but somehow less idiomatic. The stand-out performance here, as noted elsewhere, is the vibrant, life-affirming 4th, which is quite magnificent. The remaining symphonies are never less than satisfying, although the 5th is a tad disjoint at time.
But, the sound... I still have the 35-year old vinyl, which I could never enjoy fully because of iffy surfaces. This CD set sounds spookily similar, testifying to an excellent transfer to the digital domain. It sounds simply superb, a very natural, well balanced orchestral sound with palpable hall presence, hair-raising dynamic range and boot-down-the-back-wall stage depth. It's now revealed to be the best sounding Nielsen symphonic set, bar none. Blomstedt's later Decca Digital cycle sounds just awful by comparison. Well, such is progress...
Buy it, you won't be sorry.