I love mine, had a folding for for 5 years now. Currently using a Razr. They work great, display works for about 2-3 years is my experience. It's usually cheaper to buy a new one than repair as the display assembly is a new chassis with the hinge.
I don't use a case, the display is protected by closing it, but Motorola included one and they include the protective screen cover (mandatory). As flexible display technology improves, I expect they will last longer.

A whole group of folding phone haters has emerged, normal people just don't buy the thing they don't want. Theses people go on crusades blathering on about their opinion, of which I couldn't care less about. They seem to be triggered by the area where the display bends ( I don't notice it) but it is there and I can feel it, how fragile the device is but I see people with broken displays on regular phones all the time, and the price ( they can't afford one? ). I assume they just need a proper hobby.