vette - simply put our equipment is capable of competing at any level. This week we are here at the Snowbirds with some of the best on road drivers in the world. Viper drivers are in A Mains in 5 of the 7 classes we entered and 5 of the 8 total classes.
Adjustable to any driving style, lap top not required for at track adjustments and many, many features to help you enjoy. If you are only running 17.5 TC, then the regular VTX10 or VTX10BE are the way to go. The R series is for lower modified motors.
Is there a difference?: yes, smoother, provides more power, more adjustability.
As for motors, I might wait a little bit to see what ROAR rules become.