Personally, I have taken one before...I do not think it's worth a grand or more. Maybe $500 or less...because all of it you can study by buying the $40 (or less) Kaplan book and even use Dr Collins packet for only $300. Also, for science section (especially chemistry) I watched Chad's videos and he explain things very well and when I got them, they were free.
Along with the classroom setting from the course I guess the content and practice materials they provide you is a lot...but I believe you can find other alternatives which are cheaper than Kaplan. Look around, there are better materials to practice on, and you can always get help from friends or even teach yourself. I don't think Kaplan is worth the money.
Hope this helps