Had a similar experience a couple of years ago. Listed a food van, someone bought without asking a single question. They drove 3 hours here to collect it and spent 2 hours here going over every square inch of it, with my husband pointing out absolutely everything he could that might be wrong with it. We have her multiple options to back out, but right or wrong she wanted it and wasn't leaving without it.
A few days later, got a very nasty email saying it was significantly not as described and that it wasn't registered (which was clearly stated in the ad, plus I sent multiple emails post sale to tell her about such, in case she had just looked at the photos. She denied seeing the emails).
Long story short, we ended up in court. 4 court visits later and the case was found in our favour. She also admitted in court that she had only looked at the photos and that she had in fact received the emails about the registration.
Turns out she has bipolar and when she goes off her meds, she buys stuff. Her husband had told her she could come and look at it, but wasn't to buy it until she had discussed it with him, despite the fact she had already hit the BIN button. HE instigated the SNAD case trying to force us to take it back. His reasons were, all the multitude of stuff she had bought in the past he could use, like the spa, the outdoor settings, the clothesline, the furniture etc etc, but HE had no use for this so was demanding his money back.
It got very ugly and it cost us nearly as much in legal costs as what we got for the food van. Even though the courts said she had to pay our costs, there is no way of enforcing it. We have just finished paying those costs off. At least her debt collector husband didn't get his own way, which upset him greatly, because by his own admission, he always gets his own way, or else (yes, it was a threat from the Cicilian mafia!!).
I got my one and only negative for the experience.
