I like them. I bought them this spring, and I opted to get the previous version because it was only $130 instead of like $500. They were coming out with a new version in a few months, so it was even cheaper than usual for the previous edition because it would be 2 editions old pretty soon (and now it is!). Our professors didn't really use these, and I discovered they were sorta their "secret weapon." The things they said in class that weren't in our text often came from PSAP, and some profs would pull test questions from them.