I used the Law School Legends Torts, Contracts, Civil Procedure and Constitutional Law CD's during my first semester of 1L year. Here's what I thought:
Civ Pro: AWESOME. Richard Freer is a great teacher, the lectures are easy to follow, and it genuinely helped my studies.
Con Law: useful. Didn't go into the nuts and bolts we covered as much, but it gave some good deeper insights into Con Law.
Contracts: kinda helpful. K's is a pretty case/teacher-specific course, where the cases your prof uses really matter to them. He covered a lot of our material, but it wasn't always on point, and his voice is very distracting.
Torts: kinda helpful. He simplifies the concepts and pretty accurately predicts what issues will be most tested, but as torts is so fact and rule-specific, I found regular old studying more helpful than listening to the CD.