I have the nobile skimboard, I don't think its as efficient as a Door-style board because u need to ride it slower to be in control (my spot is always small waves and heavy chop in light wind) that way u can't use the apparant wind from the kite that much and need to rely more on the grunt of the kite and moving the kite a lot if u need to slow down or speed up to get over obstacles and waves.
However in this light wind even with a door u won't be able to jump higher than a meter or so, so basically u can only do some simple rotations and so on. In that aspect riding the strapless skimboard is a big challenge, controlling the board with your stance, jybing and so on are fun things to do and they can be pleasant in a different way than riding a twintip. Also for the smaller waves this board has a lot of glide to waveride with (aswell as the directional outline wich is great offcourse).
However because it lets u ride this slow u shoot upwind with it, even in higher wind conditions I sometimes grab this board because the current at our spot is too strong for anyone on a twintip to do anything but cruising.
so it depends on what kind of riding u expect in this low wind, simple cruising on a twintip or the more technical aspect of a directional strapless surfskim
see if u can try one at the beach.
same as in the other thread, if u want some detailed pictures of the board just send a pm