Heard of it (hard to avoid hearing of it), haven't read it so I can't honestly comment. I suspect one description I read might be close to the mark - Mills and Bang
last month I received that for the shop, but didn't sell it (and didn't read it). Now that I've given that back, they gave me "fifty shades of black" ... guess I won't be selling that either...
Those I know who've actually read any of it say it's badly written and pure hype. The Story of O is a classic in the SM arena. 50 Shades of How Can I Just Rake in The Cash, on the other hand, sounds like a trouser leg of time away.