I've been mostly using only R Compound tires for the past 10 years. I did a track event yesterday at Streets of Willow Springs and didn't have time to mount my NT01 R compounds before attending. Therefore, I dusted off my old NT05 street tires that haven't been used in 3 years and put them on the car. I can't believe how much fun it was driving a looser car. Even though the car was loose, it was easy to catch and correct. I softened my front and rear rebound and compression settings by two clicks which helped a bit. I was surprised on how easy the car was to drive even when it was loose. I'm going to run street tires for a few more events for both entertainment value as well as to hopefully improve my car control.