Blueprint is really where it's at when it comes to LSAT prep. Dylan is a fantastic instructor. He's really funny and understands the LSAT backward and forward. My score went up 12 points from my diagnostic (I'm retaking in June because I know I can do better if I re-go over all my homework from class)
I think I would suggest taking the class meant for the June LSAT and take the October once you've had enough time to really solidify everything. It's a ton of homework and a lot of time for someone who works full time and goes to school full time. Worth every single penny though!
I didn't have as much time as I would have liked to do the homework and go over everything before the next class. If you have more time to spend, I would just take the class meant for the LSAT you are studying for.
I looked forward to class most of the time and always felt more confident about the LSAT after leaving class. I was also not nervous going into the test and that peace of mind is worth the money right there.
I would highly suggest it if you're serious about the LSAT and serious about getting into law school.