The NS Demi Anky Universal offers control without discomfort or severity.  Although single jointed, the NS Demi Anky is ergonomically designed to eradicate the nutcracker action and subsequent problems that the traditional straight-armed single jointed snaffle can cause.  It is brilliant for faster work such as jumping etc as you can turn much more easily and it generally eliminates the head toss when asking for a downward transition, or lengthening and shortening in between fences.  If you need to upgrade from a snaffle, it is highly recommended as you are staying with a mild mouthpiece but subtly simultaneously employing other pressure points