I try to buy HUO and look at the condition of the 1 I am buying and the others the seller has.Usually if you see all the sellers personal machines are kept up then its going to be a good machine.Big difference on older machines they can have a long history of plays and still be in good shape.There are also many types of buyers and sellers I prefer newer low play games but others love all games and are willing to put in the time and work to get a game back from the dead.Both are enjoying Pinball .