the CEN Matrix TR Factory Team truck does NOT come with the machined steering knuckles. Thats a $70 upgrade last time I checked.
As for durability, on my RC8T conversion using the RC Monster setup, I had issues with breaking the plastic ends on the chassis braces. I had to upgrade to Kings headz braces. My RC8T also came already with the king Headz steering knuckles. Other than that, its been great. I haven't had any other breakage issues but have seen some.
very curious about the zcars. remember they were selling for like $199 a few times. if the truggies do that, I could be very interested i doing 2 of them.