¡A que sí!

I have used this book for one semester in Advanced composition and conversation, though I have been using some of its exercises and suggestions for years before I decided it was going to be a required book. I find the articles very well chosen, most of them elicit a lot of discussion and the cultural topics are both varied and interesting, with enough detail to make the students ask questions and remember things. The discussion activities are also very creative. I also like its emphasis on vocabulary that causes problems to English speakers. However, if you are looking for a grammar book this is definitely not it. It does have a companion workbook that includes a grammar review and exercises.