I'm not yet read this book. But just reading. But what I've read so far is just nice. I was jumping from one to another trying to find best book (and I'm new in Haskell but not in programming). Comparing to all another existing books for beginners (not including "Learn Haskell for great good" - because that one is good also). So, why I like this books so far - it just because it says how to use the language and its syntax without telling useless "bla-bla-bla" among the lines. Just concise like like it should.
Extremely helpful for people like me who have no experience with functional programming and recursive programming. Goes in depth enough to understand how to implement the various functions in Haskell's library. Only thing I didn't like is they used a lot of characters in their program description that are not the actual characters you program with. Such as: They would use an actually arrow to write... Int (arrow) [Int] instead of the way it is actually coded... Int -> [Int]... Overall a great book, would recommend it to anyone desiring to learn Haskell.