I have a Panzer III, Panzer IV, and a Stug - the Panzer III and Stug are a blast to run with the Panzer IV close behind. I purchased the Panzer III and Stug from Matomart and had absoluetly no issues. From what I have read in the forums here, if you do encounter a problem, their Customer Service will take care of you. You can also contact Phil at RCTankWars and he will verify your tank is in running order before shipping it out. I bet you could also have Phil install the 3:1 gearboxes as well so your tank would have the most common upgrade done up front.