Tank worked good out of the box, but I noticed a few problems: (1) the headlight don't work. Its getting power so it must be the LED bulb. (2) The 3rd day I had it, the motherboard shorted out. I sent Heng Long an email about it and they sent me a new motherboard. The tank has ran great since. (3) last week the smoke unit quit working. The heating unit is working, but the fan is not blowing the smoke out the exhaust. The fan motor is running, but I don't think the fan blade is turning. I sent an email last weekend, but haven't received an answer yet. Their a little slow answering emails. When they do respond their support is great. I'll give them 5 stars when I get an answer on the smoke unit. If I don't get one soon, I'll lower it. One other thing, which is no big deal, the machine gun for the turret was missing.