I got my HL Tiger two weeks ago and ran it about 20min and on of the tracks started acting up. I opened the tank and found that one of the gears (metal) was out of round and thus only meshing with the other gears about 65% of the time. I ordered the new steel gears and Im waiting for them to come. The metal gears are cast and in my opinion very badly. You should have seen mine, woobly, woobbly. I've been told the steel gears are machine cut and much better than the metal ones.