Refurbished P3s was great.
Refurbished P4s was great. It did lose a prop and crashed after 11 months. Screws came loose in the prop mount. Half my fault for not checking it over.
The replacement was terrible. It had a problem right off. I told DJI. DJI service was trying to tell me ways to fix it. It was an intermittent problem and very hard to tell if it was fixed. Eight days out of a 30 day warranty, it ended up crashed in the bottom of a canyon. No roads and no trails to retrieve it. With my disability, it's a permanent fixture. I hope the battery doesn't start a forest fire.