Sorry guys, but I am going to disagree with Pierre and Rick H...
I have been using Superfeet since 1979, and will swear by them... (not at them)...
They are as high performance a footbed as you'll find on the market. And they can be made in various ways, based upon the preferences of the customer. And a really nice feature is that they can be remolded. Most footbeds cannot be reshaped after the initial fitting. At the local shop that I do some favors for, I still make the footbeds their customers need.
Over the years, I have tried several different brands/types of footbeds, and haven't found any which give me the degree of sensitivity to the snow,a nd support, and comfort as my Full-Cork's. And they are WARM!!! As cork is a pretty decent insulator, I find that they help provide a nice layer to help block out the cold after hours standing on the snow, day after day.
One point of agreement is that the basic requirement is the need for a competent craftsman to make them, just as would be needed for any product. Some barely trained shop flunky can do a skier more harm than good with a poor fit, regardless of the product used.
I worked for Superfeet for a few years back in the 80's, and the system hasn't changed much since its introduction, other than adding a few additional products to the line. At that time, we were sent through a full training program to learn not only the product, but also a good deal of anatomy, and the various ways to adapt the product to various individual needs.
There are a lot of good, beneficial footbed products on the market. But to say one is better than any other doesn't hold water! Any footbed is only as good as the technician making them.