The boat in the above picture is boardless, Aquarius has been doing it for a good while. It tacks fine, just have to get the hang of it. I think it points very well, some say better with the self tacker. Downwind you lose some sail area. Here's what'll be a boring video of the boat with the self tacking set up. I filmed a bunch of tacks, some are pretty ugly.

'09 Viper F16 USA102
A Cat USA 366