I note the weight of the vestibule in addition to the 2kg tent is not quoted. :-)
Good article though, and comments about the need for a tent made me think. I still like the roominess of my Hex 3 which is pretty bombproof in high wind, and big enough to not have to worry about condensation too much.
Half the weight too, including a MYOG Tyvek bathtub groundsheet.
Roger: The hex 3 has loops sewn in to support the bathtub walls.