My RSR's were the "new compound" which is ratshit compared to the old compound that they got their great bang for buck name on. They jacked the prices, and cut the grip down... I had like 60% 235 RSR's on the front, and new 265 123S's on the back, so it was just understeering everywhere, I couldn't get over 100km/h on the left hand sweeper at the start of the back section at Winton without the front wanting to walk. On the skidpan at DECA I'd snap 2nd and it would just be sideways the entire length of the pan, with these on the rear it just throws you forwards and pulls like a freight train
123S is boss, at $440 fitted for 2 x 265 18, $400 fitted for 2 x 235 18, you can't go wrong.
Not sure how fast they wear... I've just swapped back to my daily street wheels for now so I'm not ripping through really expensive stuff. Will put the RSR's up for sale on DriftSales, someone will want some mad front grips for their drift car yo.