How good are the Power Score LSAT Bible's?

I am thinking of buying the complete 3 book series of the Power Score bibles, but i was wondering how good they are at preparing students for the test. Has anyone used these books to prepare for the lsat? If so, what score did you receive, and do you credit these books for your score? I should be able to get the complete set for $130 new or $80 used on Amazon, Nb but i want to make sure im not wasting my time most importantly. How relevant are these books to the actual lsat? Are they up to date, or have they become obsolete? thanks any comments are appreciated!