So I just finished up a week in Disney wearing the XXXI Fibe Prints. Very comfortable casual wear shoe. Brought a pair is Flyknit Airmax as well and the XXXI were FAR more comfortable walking all day long. Definately delivers comfort and cushioning compared to a running shoe.
On the customs thoughts, I agree it's a unique collector piece of art that you can wear. If you hve the funds why not. I have two XI concord lows custom from KickassO