I have three copies of the album, including the reissue, and I agree that it's hard to find a bad sounding pressing of The Wall. The reissue sounds quite good, and I think it's well worth the sticker price, but I do prefer the original pressings. One quibble I have about the reissue is that it was mastered at a lower volume that the original, but otherwise it's superb. It was a welcome change in that it was dead quiet as many used copies are very noisy due to wear-and-tear, but still manage to sound glorious. If the used copy you're looking at is indeed NM I'd say go for it over the reissue.