As Phil Plait and others point out, the evidence on this one really isn’t sufficient to be getting attached to such extraordinary claims yet.
I still think it does have better odds than I would have given the faster-than-light neutrinos when they were first announced, though.
It sounds like something out of science fiction (especially when you call it that), but NASA says it works.
It seems to defy conservation of momentum and may work by interacting with virtual particles. And since three independently built ones have seemed to work, it probably isn’t an error.