I've been using the Green Superfeet for years in my Alpine Touring boots (Scarpa) and between the insoles and thermofit liners, I never get blisters. I've been told I have flat feet, so I like the extra arch support these insoles provide. Plus, they are very durable. I've swapped my green insoles out of successive ski boots for years and they are still going strong.
From what I've seen, these insoles come in a vast array of lengths and arch heights. I can't speak to all of those, but I have narrow feet with flattish arches and the "normal" size works for me.
The premium insole (the one reviewed here) is just a nicer, winterized version of their classic green insole. I don't notice any real temperature difference with the reflective foil, but it probably doesn't hurt either.
Overall, a great addition to a pair of ski boots.