I got this as a rental for my biology class. It is a great deal! I get to use it and once the semester is over I can return it! Way better than purchasing a $200-$300 book and never using it again. The only downside is that within the first chapter I have already found writing in it, from whoever used it or owned it before me. I hope I don’t get blamed for it! I may find more along the way. I guess on a positive note at least they have better handwriting compared to mine!