What can I say, - it's Sylvia Plath. She's a wonderful poet. Her poems are full of raw emotion.
If you like to play detective, you might enjoy Ariel - The Restored Edition even more. I did. The restored edition shows Ariel the way Plath intended for it to be published - with alternate title ideas, and many poems in different forms - and illustrates very clearly the impact her husband's editing had on this publication.