BrainTeased - 12th scales are alot less work and imo alot more fun. They are easy to setup and are definately not slow.
You don't have as many tuning options in 12th scale and in most cases the stock setup is pretty good. I comes down to tires, lube, t-plate, shock and front suspension so if you can tune a TC you can tune a 12th scale. I set up my car once at the start of the race day and that's it. I adjust the tweek and rotate tires after each round(if needed). It's alot less work then I used to do with a TC which gives me more time to relax and enjoy the day.