I've been running a TC-5 for a couple months now. By far it is more durable than my old RDX. I have worked out some issues as normal. I am very pleased with the car. I switched to the Tamiya Flourine coated shocks today wich made a world of difference. They are a bit shorter but you can make up for it by unscrewing the ball caps on the end by about 3 threads AND the associated springs work perfectly. I am very impressed. 13.5 bl rubber tires on asphalt.. I love it. I had to rebuild my first diff tonight after racing. I have ran the same diffs for 2 months now with one rebuild. I can't wait for the aluminum diffs to come out though. Great car.