I think I'm up to nine of these now and I find them to be hit or miss. Overall, they are a great value for the product, but some run better than others. As many have said the earlier ones were not as consistent. My best runners are any of the 4-8-4's, the Challenger, and the Mikado. My Camelback has an issue with the tender trucks side frames spreading apart far enough that the wheel's fall off. My K4s (pre-war version) has the front pony truck riding high as does the T-1.
I still wouldn't hesitate to pick one up if the price was right, the condition was good, and if finances permitted.
