I used the Touchstone Seriesyears ago at my previous uni and remember hating it. Like the pages were filled with all these "speak like a native speaker" sections which were just bizarre, and each page had so much stuff crammed into it that it usually stressed me out. Maybe part of the problem was the program I was teaching in; I "shared" the book with other teachers and was assigned 1 or 2 pages/class so had to teach the pages I hated instead of just skipping over them like I normally would.
Anyway, it seems like a new edition has come out and Touchstone is not as terrible as it once was. Plus, I usually just choose 1 or 2 pages out of each chapter and then add in my own material so the I just don't use the pages that I don't like. I still much prefer a series like 4 Corners or World Link but I don't have any major complaints about Touchstone for a general, 4-skills kind of textbook.