I always find the bad seller reports interesting reads.
I can see both sides here, as I think others have said..

From the buyer's side, he wanted to test the machine and wasn't permitted and seems he got a bit of a runaround from the seller. He's leery because of that. Fair enough.

From the seller's side...he already sold the machine and the buyer then wants to show up and inspect it with a tech. That raises concerns in a big way that the guy is just going to nitpick it to death.

Honestly I gotta say that I side with the seller here. The big sticking point is that you already bought the machine. If you had made arrangements with the seller to inspect the machine prior to purchase that would be a different story. I understand that's not always workable with auctions, but as a seller I would probably do the same thing.

If someone bought a game from me and then, after purchasing it, wanted to show up to do a deep inspection, I would back the heck away from that. It's asking for trouble and, at least to me, immediately tells me that the deal can be riddled with problems down the road.

I always encourage people to look at a machine before they pay.