I will no doubt be corrected if wrong, but our nationals run over 2 days. Saturday is for 19t or 10.5 motors only whilst Sunday is broken down into 2 classes: Sportsman (12t limit) or Open (whatever mod or brushless you like). There are also a couple of 2 day events for each class as well. Most, if not all events are fully booked out and do indeed have the best drivers competing at them. It's amazing to watch the finals as you may think that you are a good driver, but nothing compared to them when they are putting 4 or 5 laps on you!