I will say that JFT wheels and foam are high quality and worth every penny. The cost of the foam doughnuts compared to other brands are similar in price or just a few ¥ more. I've only tried out the wheels with different flexes characteristic and I could really feel the difference in how the car handled. As for the foams, I haven't tried them yet. My local hobby shop - FUTABA Pro Shop doesn't have them in stock. But I will try them at my local track ----> Yatabe Arena!!!