Arabiyyat al-Naas (Part Three): An Advanced Course in Arabic

It really depends on your level and interest, but I found this book to be an excellent stepping stone to move from intermediate to advanced fluency for someone already advanced in basic grammar. If you want to learn the basics of grammar, you need a different book.

I have yet to find an Arabic textbook I'm satisfied with, this is no exception. This book doesn't teach grammar well at all, and it's so repetitive from chapter to chapter it's unexciting even boring. Furthermore it provides little incentive to actually learn new vocabulary.