The Nirvana has a wide and shallow concave. This feature allows this ski to be stable and maneuverable in the grips of the edge. It glides without spending too much energy.
The longer flat spot gives it front and rear stability when approaching turns and allowing it to be early out of buoy. The edge change is gradual and allows you to stay light on the rope in wake crossings.
It takes direction well because of the softer flex and works for all levels and can take your skiing to shorter rope lengths.