My friend has had several pinball machines and when I lived with him we had The Simpsons pinball machine in the house. First off all they're awesome. So amazingly addictive buying a pinball machine is something that you'll not regret. Throughout the ones I know he's owned Lethal Weapon was always having something wrong with it. Bulbs went all the time and various other problems occured and he needed to call someone in to look at it. Very expensive if you're calling someone in. He had Dr Who aswell and as far as I know nothing ever went wrong with that and neither did anything go wrong with the Simpsons aside from the occasional bulb needing replacing. I don't know how much you're looking to spend on a machine but as far as I know he always spent around £2000+. Lucky 3 year old if that's your price range.