Hmm, 42,2 on the Flesch–Kincaid readability test according to manybooks.net.
Anyway, couldn't resist and downloaded the book with the intention of reading it.
Well, 42,2 for a non-native English speaker/reader should probably challenge my language skills just a tad..
(
Flesch-Kincaid Reading Ease)
Edit: Just to compare; "The Hitchhikers Guide to the Galaxy" has an index of 67,2 according to
Amazon.com, stating that 78% of the sold books are harder to read.