I was just informed today that my professor would be using this 上級への扉 book for the 4th year students at my college. We are finishing up the Intermediate book by Japan Times right now in my 3rd year class. I was just wondering if anybody out there has had any experience with it yet and what are their thoughts/impressions. Here is the website:

http://tobira.9640.jp/xoops/

Yup. I have it.
Good book, has many grammar points, most from 3kyuu and some from 2kyuu. It lacks in exercises.

Personally I never finished it, stopped in lesson 14/15 lol. I will soon review some grammar and learn the points I miss (anki).