I am not speaking for Phoenix, but I feel they can be trusted to properly inspect the used units they sell, whether PCs or other brands. In-fact, I am going out on a limb to say that it is a good idea to shake down overnight near the factory, any used purchase from Phoenix, to make sure it is in as good of order as advertised. If anything isn't as advertised, I assume they will make it right (within reason of coarse) the next work day.