Turrible. Even with the bucket-ish seats headroom is nonexistent. If I sat straight up, my chin would be level with the headliner. Interior is meh. Sea of hard plastic. The panoramic sunroof is nice though! And the exterior styling is great.
So far the new Jetta is the best backseat lyft. Fantastic leather, lots of room, and well-thought out interior. Prius 5 is surprisingly nice too.
(edit) Between the crazy high and thick sills, and the tiny rear door, getting out of the rear seats is more of a pain than getting out of my Miata.