1st Lesson Learned - Try sitting in race seats before purchasing a seat. Unfortunately, there are few if any show rooms that would have every seat of interest available to sit in. If it were in the middle of the race season I would have gone to race and asked to sit in other people's seats. Keep this in mind if you are interested in buying a seat because many people at the track will let you sit in their cars.
This Sparco Circuit II is a little too big for me and the car. Cushions will be needed to support the sides of my torso. The other problem is that the halo of the seat interferes with the cage preventing the seat from sliding back farther. Luckily, it gives me just about the right amount of room. If you're about my size or smaller you definitely want a regular Circuit instead of a Circuit II. For reference, I'm 5'10" and 155 lbs with a 32" waist.