Smear : you really have to put a lot of ink and immediately close the book to have some. In practice I have none.
Look and feel : The texture and feel is quite different from paper. It's basically paper laminated with some sort of plastic. It depends on the pen you're using[1]. If you're using a medium pen, it feels a lot like a whiteboard (gliding feeling) . With a fine pen, it's a little bit more scratchy.
[1] they are all using Staedtler Lumacolor correctable 305 pens. I wonder if there's an expired patent or if it's just a happy coincidence
While those works, they can leave some traces. The guy behind Wipebook made a video about it [1]. See also the Tips and Tricks videos from the same company [2] [3]
