The soft foam under your foot is great, you just need to know who to mold them and maybe put pieces of extra material below. The race liner is very thin underfoot so you can still use your normal custom footbed.
Just watch out to get the right Intuition for the boot, depending on the volume of your skiing boot.
Intutions are allways lighter and warmer for same volume than any other liners. Performance is also great, there are enough people in the snowboard worldcup that prefer Intuitions over foamies as Intuitions don't stiffen up a soft boot compared to hard foam (which is the only decent way to go if you ski a lot). You have to remold Intutions from time to time (every 60-70 days) and they wil last longer than any modern foam boots. Old foam boots could hold up 300-400 days but that's over since the abolishment of several materials that are not considered environmently friendly or safe.
Intutions won't work in any too wide shell, as they loose a tiny bit of volume each time you bake them. As for foamies the fitter must be competent to achieve best results, and never ever forget to use toecaps with Intuitons as otherwise there will be no fun, and only click in, not close the buckles during the forming stage.