Andy and Jason can speak to the motivation to build the tire.
I'll share with you some things I discovered during some testing with racers of all skill levels driving Traxxas Slashes in RTR and Mod configurations.
When testing the JConcepts Goosebump tires, the group I found who were the happiest and benefited the most were the Novice and beginner RC Racers. At the time we were only using them on the Traxxas vehicle.
Everyone who tried them (beginner to accomplished racer) were really excited about the performance, but the Novice were the ones the happiest.
The test track was a loamy surface, so stock Slash and Proline Switch still lacked grip for people without good throttle control. You could often sense the frustration build as many new racers struggle with a 2wd vehicle on low grip dirt tracks.
Once I put the SCT Goosebumps on their trucks, they were able to control their vehicles, make laps, and really feel like they accomplished something.
Its made me seriously consider the added benefit this type of tire provides to new and unskilled racers. That being better control of a 2wd vehicle which in turn increases the likelyhood they will continue to participate in the sport.
Visually, the tires look true to the class during operation.
The 17 Truck has Goosebumps, the 21 Truck is running Traxxas Tires.