Tatiana Nikolayeva is considered the foremost interpreter of these works, but these are probably not her best recordings of the Preludes and Fugues. She made earlier recordings on the Melodiya label that are generally said to be technically better and equipped with more spirit than these 1990 accounts on Hyperion. As I've been informed, you can find that set on a new issue from the Regis label. This one, however, is far from ideal. Many of these preludes and fugues sound labored and heavy, and above all slow. She takes fairly everything at much more restrained tempi than the composer indicated; sometimes with wonderful results but often the music suffers of it. The humor in the E flat major prelude gets totally lost, for example, and the tension in the E flat minor sounds fabricated instead of natural. There's no question that she can also be staggeringly beautiful, such as in the sunny A major fugue or the A flat major prelude, but in the end the set's unevenness is too large. Much of the spirit in Shostakovich' music has gone here, and many fugues are played so slowly that they made me quite impatient. Additionally, her dragging takes often result in a very pounding, labored and tiresome sound, like in the G major and D flat major fugues. The muddy studio sound of Hyperion doesn't help either. So, in spite of many fine moments, this set is too unbalanced to get a really good recommendation. I'd go for Ashkenazy, who plays much faster, more vivid and natural and without Nikolayeva's too affected touch. Or maybe Scherbakov or Nikolayeva's earlier set, though I don't know the two of those myself. And, finally: you can get both Ashkenazy and Scherbakov at a much lower price than this set alone.
(To a few other reviewers: yes, it's possible not to like this set as much as you do)