Is Consciousness an Illusion?

Dan Denne says consciousness is all an illusion or a confusion. Ando respect that line, i think it's a hard enough problem that we need to be exploring every a, every avenue here. But there is something kind of faintly unbelievable about the whole idea that the data of consciousness here are an illusion me and so on. I don't see how a claim that consciousness itself is an illusion can ever flyy.