I have replaced the standard (already very good aluminium) dampers of my Corally RDX with the TRF dampers.
What I already noticed during assembly was the incredible smoothness of motion. These dampers are in a league of their own! Testing the new dampers showed much improved handling characteristics. The chassis is providing so much more grip!
In touring car racing there are two components that make or break your car. One is the diff, and the second are the shocks. Highly recommended to get the best equipment there, and these dampers are the best. Period.
I combined them with X-Ray springs. These springs are specified with numeric values for spring constant. That works so much better when setting up the car than relative terms like "soft", "medium" and "hard". Highly recommend Tamiya to market spring sets with specified spring constants.