I did the 9-session prep course and had an amazing experience with Sage and Ryan. The lessons are well structured, teachers are extremely smart, and are available for you (even outside the classroom). The classes are big enough so that there is strong group cohesion but small enough so that you can interact with everyone on a regular basis.
Plus, the tools and resources available to students are very helpful. Especially the software to take practice tests / questions, it helps practice and assimilate each topic addressed during the courses, it is very straightforward to use and actually very similar to the official test, which I guess takes away the element of surprise on D-day.
It's all well thought out and you have the option to take evening / weekend classes to accommodate around professional commitments.
I would highly recommend the 9-course program as it is structured to keep you focused and provides all the tools for you to succeed.