Full Disclosure: I am currently an employee of Blueprint LSAT Preparation (not an instructor), and am writing solely based on my experience as a customer in early 2009. I was never employed, nor ever dreamed of being employed, by Blueprint when I took their course. It just happened that way.
As for the LSAT prep game, there is no other company that can even begin to compare to Blueprint. There is no question that they are the absolute best method for preparing for the LSAT. I owe my amazing score and any future success to their course.
I think what I enjoyed the most about the course were the Blueprint instructors. They are absolutely fantastic, and they truly make the company as great as it is. It's not some stuffy old man who you can't relate to teaching you about logic, it's an entertaining and energetic academic experience. My instructor, Jay, was a younger guy who not only understood what I was looking for in someone who has to teach all of the ridiculous material on the LSAT, but he genuinely cared about how we all did on the test and would take the time to make sure we were grasping the concepts and consistently improving. He would come early and stay after to make sure all of our questions were answered, in addition to the extensive amount of class time that we paid for.
Also, Blueprint's curriculum is amazing. There is not only a specific technique and method for anything and everything you could possibly see on the test, they also teach you the fundamentals required to understand the logical foundation on which the entire LSAT is based. It's not just little tricks to answering questions that you see in SAT prep (though they do have a lot of those), the real quality of the material comes in their attempts to illustrate and teach an entire logical foundation that can then be coupled with their fantastic methods to really succeed throughout the test. You see patterns and begin to really understand the test in a holistic manner.
Aside from the teaching and the material in the class, there is an immense amount of online resources and extras that are available with your course. Literally hundreds of video explanations and resources to help you with homework. They are as effective and engaging as they are vast, and they played a serious part in my success.
Blueprint is a truly great learning experience, and I encourage any one interested in to check them out. I honestly would have paid triple for the quality of education I received.