Pros: Tight carving performance, edge hold, adaptive sidecut, good balance between dampness and transition responsiveness
Cons: This is an expert ski, best for skiers with solid carving form who know how to set and release edge pressure and manage very fast transitions
The i.supershape magnum has scalpel-like edge grip, and I'd recommend it for an expert skier/amateur racer looking or PSIA examinees to lock down proper carve technique on frontside slopes.
The ski has medium dampness (I found comparable Rossis snappier and Atomics stiffer) and is able to hold stability at very high speeds. Turning radius is very tight, but the ski has a non-linear sidecut that is able to adapt to a pretty broad range of turn radiuses across a range of speeds. This alone sets it apart from the other skis in my quiver....it's much less locked into a specific carving radius so it feels much more versatile, but the notional carving radius is 13m so the turn range is very broad.
The skis have very nice turn rebound, so you can do edge transitions very quickly and efficiently. Even for expert skiers, the speed of the transition may be surprising so you will likely need to pay attention or the ski will outmaneuver you!
Expert skiers will almost definitely want to get an edge tune with these skis, depending on your turning stance and technique. The factory tune on mine had less than a 1 degree base bevel so at speed I couldn't get proper angulation and leg extension before the ski carved under me.....with a 1:3 bevel it turns perfectly for my technique.
Although the ski is stable at speed, skiers who prefer fast, longer (GS style) turns may want to ski a longer size with the i.supershape magnums. On a longer ski, the turning radius will still be great but you will really benefit from the extra longitudinal stability at speed. Mine are normal length for my height/weight, because I favor tight turns with high edge angle.