construction, shape, custom flex, durability, just generally skiing ability.
Iggies are the most durable skis made. Custom flex is awesome.
and they honestly just ski better than any other ski Ive ever tried.
and this shape is, thus far, my favorate shape in power. 20mm of taper between the tip and tail - the tails are easy to wash out spatula-style and they still rail on groomers.
You have to ski them to get it, but IMO they are worth every penny over normal consumer skis.