I personally have only run 1/12 scale for a couple years now but like the t-bar cars myself. I know others may disagree but it just seems they are more durable in the long run. I don't very often check the tweak on my RC12L3 but when I do it is always pretty close whereas a friend that has a new CRC Carpet Knife has to check the tweak almost every race or it's off. Those little tweak springs just don't seem to be a real good idea either. :freak: Good cars and handle well but I just like the Associated cars better.