Paging gm2 to the white courtesy phone...
I know Garrett loves the thing - he may have even converted to scientology he liked it so much, but I may be hazy on that topic. He also has done tons or cornerwork for them, so he can probably give you some good insights.
lol... haven't quite converted.
imo anyone that rides a motorycle at all, anywhere, should take level 1. even if you never step on to a track again.
yes, HOW they teach is very scientologyish. but (despite there being material available to browse, should you wish) they never push any of that on you at all. if you didn't already know it and there weren't some stickers about etc, you wouldn't know they are nutters.
what they do have is a system. a very refined, time-tested, deliberate system. it's NOT a go-fast school. it's a cornering school. your first few sessions in L1 will using 4th gear, no brakes. you're going SLOW. picking up the pace comes later as a function of lessons you're learning; there's no point where they say, ok, do that, only faster.
i obviously got a lot out of it.. i've been through 1-4, and did 4 twice (4 is basically a private coaching session, sorta). and as noted i've cornerworked a lot for them.. so if you have questions, ask away.