Metzinger's work is some of the most exciting philosophy I've read recently. The Ego Tunnel is a short restatement of Metzinger's view of consciousness (first laid out in his massive Being No One: The Self-Model Theory of Subjectivity
, bits of which I've read) in a more approachable format. The exposition is broken up by interviews with researchers on different aspects of consciousness, whose views sometimes diverge from the picture Metzinger paints.
What distinguishes Metzinger from other philosophers doing cog-sci influenced philosophy of mind is his openness of the wide implications of these ideas. His last chapters sketch how we could create a new kind of ethics built on our revised understanding of the nature of experience. In this book he only gestures at what this might look like, but the scope of his philosophical outlook is extraordinarily wide.