I passed N2 with a pretty healthy margin this July, and I think this book definitely helped me boost my reading score. The readings are difficult, but it covers all the types you will find on the JLPT and gives you LOTS of chances to practice them. And unlike Soumatome Reading, Kanzen Master is definitely at the N2 level. I can't recommend this book highly enough!
It also gives advice for each question and reading type, and I've heard that the advice can be pretty useful. I got bored of it myself though and just focused on the actual readings. ^^;;
I plan to move on to the N1 book soon!