I was given the Oxford textbooks but bought the Keith Pledger ones instead because i didn't like them. I didn't notice any mistakes in the S1 book. Admittedly, i started my revision the day before the exam and got 100 UMS in January. The great thing about the book is that it's so easy to revise from. Everything you need to know is in there and the summary pages are amazing. If your going for the fast efficient approach i would definitely recommend the Keith Pledger books. The CD is a lifesaver.