I have a set of early Tiger I tracks, KV I tracks and drive sprockets, and a TU. The finishing and quality of the tracks seems to be top notch, but I was recently told that the TU's are prone to premature failure. Haven't run the tank much since I've installed the TU, so only time will tell how long it lasts. Very impressed with their service. I ordered the tracks last Friday, and they arrived at the door yesterday morning! Four days from Singapore to Canada! Kudos to Fedex too.