Great overall, no need for other books, though Monads still ill-explained

Very good introduction to Haskell and functional programming in general. Covers Haskell's type inference system and unconventional syntax in a comfortable, clear way. Lazy evaluation and its effects on the language are likewise explained in an clear approachable way.
There's lots of SICP-like exercises to practice with if you want, though their placement makes the book a bit confusing at times if you don't as it's hard to tell the exercises and the material apart sometimes.
I haven't looked at competing Haskell books, but after reading this one, I don't see the need to. This book doesn't explain monads particularly well (though most other explanations, besides one explanation in a reddit comment I saw, are equally not understandable, so that's no great fault).
Overall, a great book for programmers who want to get into functional programming or quickly learn Haskell.

Other Reviews

• A good book for the advanced programmer or the absolute beginner, but bloody confusing for intermediate college students.
• Great overall, no need for other books, though Monads still ill-explained
• Good gradual introduction; good value for money