I'm coming up on my 20th day at CarLimits. It is brilliant, you will feel the limits and realize how little you know about driving :), but also have a blast, especially in an 86/BRZ. In a 4 people day, you get a lot of driving time and will be knackered by the end of the day. The hardest part is after the day is over and you go home and feel like everyone drives ridiculously slow.
As Vad said, It is hard on the tyres, the surface is very abrasive, but you can manage. My last set of PS4s lasted 6 track days and 3 car limits days, and I did not go easy on them - to say the least. My Primacies did not do anywhere near as well.
If you are lucky and get a wet day it is the best training ever for wet surfaces, plus you will be sidways a lot :). But don't worry you will be sideways on a normal day too. And backwards, and all possible angles.