Compared to the basic plastic the premium jokeri is appreciably more overstable, which makes it a fantastic counterpart. You can hammer this forehand into a headwind and back it to fade out still. It has the torque resistance of the zone whilst having a less aggressive, more putter like fade, which gives me confidence using it over a greater range of distances.
Premium is a flexible and tacky plastic that feels ideal for cold and wet days, like a slightly stiffer Z FLX. I think for slower molds I appreciate the stiffness of ultrium to get a cleaner release for flicks, but this will have its place for backhands and really cold days.