I haven't read Nicholas Perrin's Thomas, The Other Gospel, but I've certainly read (and reviewed) April DeConick's Recovering the Original Gospel of Thomas which he criticizes. Judging from April's recent blog-citations (I, II, III, IV, V), it's evident that Perrin distorts her position at times. Have a look-see: it's pretty embarassing.
Though I disagree with April's theory about the way Thomas evolved, I really like her book. (I can't recall the last time reading something I so much wanted to be right but ultimately couldn't go along with.) But whether in agreement or disagreement, we need to be sure we're representing our dialogue partners accurately.
UPDATE: Mark Goodacre has a helpful review of Perrin's book.
UPDATE (II): Over on Mike Bird's Euangelion, Nick Perrin responds to April's objections. Perrin sticks to his guns.