Yes, I love Kaplan too. God was good to me that I got it as a gift from a person who might as well have been an angel, for real. Anyway, Kaplan is amazing! Their computer interface, their section tests, topical test (not including 19 Practice tests), are exhaustive. Can you do well without it? Of course, many people on SDN have shown you can. But if you need help like I did and a course to guide you through, then by all means Kaplan is amazing.
Also, the teachers are a very, very valuable resource--more so than the classes! That's right. I said it. The classes are actually also online as "lesson on demands" so you have your virtual teacher to teach you every class that you could attend "live". However, the best thing about the Kaplan live class is that your teacher is basically also a free tutor! I mean, of course, they won't sit with you for hours on a subject (although Kaplan offers that too) but you can e-mail them questions, stay after class, etc.
My teacher has sends me "page-length" answers sometimes to questions--really amazing.