You could also spend $4.00 + media mail shipping for "Law School Confidential" and get both an overview of 1L courses, the 1L job search, and different opinions from both the author and students on study techniques that worked well.
If you're really feeling ambitious, you can go to the library or a book store, see if they have the Examples and Explanations series for 1L courses (Contracts, Civil Procedure, Torts, Constitutional Law, Property, Criminal Law), and sit down with them. Read through the table of contents, maybe skim a few chapters here and there, and get a feel for the subjects and some of the terminology. That costs you nothing.
Your money is better saved, since law school is expensive enough as it is without companies trying to take advantage of panicked students.
And for the record, NONE of the students I know who did well at my school took a Law Preview course (doesn't mean there aren't any - I don't know for sure everyone who is in the top of my class, but those I do know, didn't take one - neither did I, for that matter).
Any advantage you might get is very short-lived, as the learning curve is steep. Is $1000 worth it for a 3 or so week advantage? (and that's assuming it will take your classmates 3 weeks to get their own overview by reading through their syllabus, flipping through the table of contents of the casebook, and looking at supplements).