I have had my Tekin RsPro since they came out. It has been in 7 different vehicles. I like the fact that its always up to date using the hotwire. The RsPro has never gotten hot, and has ran with some very aggressive boost profiles to make up for a smaller motor in mod classes (7.5 in a mod oval Sprint car). the only thing is you can get lost with all the adjustments available to use. I havent tried the standard rs, but with the pro, I never have to worry about too much motor for the speedo. For me its Tekin all the way for top of the line esc!