all you guys with concerns: The main problem that everyone complained about early on (pre FT) was slop in the arms and steering rack. AE fixed this and if you did get an old kit you could still shim it. The other problem is that on high bite carpet you could strip internal gears because of flex problems. Again, pre FT.
I have a BMI version of the TC4 and I can honestly say that it is the best car that I have had. AE can finally say that they compete with the Euro cars.