I bought the english and norwegian version while trying to learn norwegian this past year, with the sole purpose of using it to strengthen my mediocre norwegian skills.
I was blown away, and could not put it down until I finished in the wee hours of the morning. The language (english, I still have not figured out norwegian) in the book is easily digestable, and the story is just so great it will really make your life better for having read it (seriously). I've since bought 5 or 6 copies for a few friends and my brother, and each of them were moved enough to buy a copy or passed their's along to someone else.
The only drawback is finding a copy somewhere, or even worse trying to find one of his other books. I cannot imagine they are anything less than extraordinary. Why this book hasn't hit the US like a lightning bolt - I will never understand.