The F and R versions should have similar handling as they both have 50/50 weight balance on the front and rear. The R however has most of the weight more towards the centre which should help it turn quicker. The tensioner that guides the belt away from the motor on the R/RS adds more bending to the belt and also increases belt losses(drag). I cant wait get to install everything and run the RS to see how it goes. Hopefully it will do well against all the TA04Rs and TRF414s that are most common here.
I like the low sleek look of the Mercedes CLK gtr.