i took kaplan advanced & would not recommend it. like i've put on other threads, my score went down --i took the oct 07 lsat at 163 and enrolled in kaplan advanced spring 08. by the end of the course i was testing at 159, which i definitely blame on their "kaplan method." esp. since the whole reason i took the course was bc i was prepping at 170+ and was confused as to why i didn't score so well. of course, lsd has helped me seen the light much more than kaplan ever did.
anywho, i recommend anything but kaplan. the best (only good?) thing about an organized course is that you have the discipline built in for you. if you aren't very disciplined, a class is prob. a good route, but NOT kaplan. esp, like mori said earlier, when you have been prepping w/powerscore.
if you have spec. questions about kaplan advanced, let me know. don't get tricked into thinking it is better than regular kaplan & take the class just bc it is the only "advanced" one out there. the one positive thing i will say about kaplan is that i think their online suite, esp. the "smart reports" part, gives you a good breakdown of your progress & areas for improvement. you could also be regimented on your own though & keep track of yr. work that way.