The hinge is by far the best design i've ever used. Battery life isn't that great but i usually have mine on a qi charger nearby to rest it on. The only negative, which by the way plagues every foldable on the market currently, is the battery life.
The phone is likely not to disappoint a customer at this price point. One thing i would recommend is when being refurbished the company should check how long the individual had the phone if the phone have any internal issues.