As a financially secure person, why would I want to spend $800 today when I can spend $800 over four months with no penalty? It doesn't make any sense in the slightest, that is unless you're not savvy enough to keep track of your money?
I was mistaken in thinking it was longer than that. If it is only about two months then it's of little value over a conventional CC (depending on when you buy it in your statement cycle).
My example with the wings is an extreme/incidental use-case, and I realize that it'd be atypical to unheard of in practice.
klarna offers a 4 equal interest free payments option. How that any different from a credit card?