Ive been pretty hard on this kit and no problems so far. Couldnt tell you how many miles, brkn odo, but it must be up over 2000, maybe 3000. Of course I use saber oil. So use saber oil. Plus my pipes nearly hanging off... no seize and still runs.
Some rust is starting to show up though but to be fair, ive left it outside and it is cast iron.