Just began reading this book and I will probably be reading it a year from now--not straight through but a chapter or two at a time while reading and re-reading the sonnets she covers although Reading it straight through would be like taking an advanced class in how to read a poem. 
 This is close reading as it should be, concentrating on the rhetoric, language, recurring imagery and sheer, boundless technique of the poems. 
 A delightful book.