The book itself is beautiful (color illustrations) and the explanatory material is impressive. Unfortunately Japanese poetry from the Heian period is generally mannered, repetitive, and dull. Poetry written by women in this era is, tragically, even more unimpressive, as they were basically restricted to writing love poetry, which relies on a handful of tropes.
For world-class poetry written by a woman at roughly the same time and in a similar tradition, check out Li Ch'ing-Chao (1084-1155), who is ridiculously talented.