My experiences with the Pinball Exchange (now located in Hamilton) are mixed. I did buy my High Speed (for retail minus a trade in value for my Wizard!) there and it has been issue free for years.
I did however request a price on an Alien Poker (as Dallas has a few I saw in the storage area) and didn't receive a reply on my numerous inquiries. Also asked how much extra the 'multiball mod' would be if they installed it. They claimed they didn't do mods but now I see they will mod lighting to LED for a extra fee.
Also of note, the retail prices listed have jumped since last year. I guess inflation is catching up.
Also they have a massive amount of disassembled machines in the storage area but wouldn't part with one to my tech buddy for a project machine. Either they fix it up and sell it (for retail) or it's not going anywhere.
Just my experiences.