I have the conventional Intuition wrap liners on a pair of Fisher boots and like them. They stiffened the flex 5 or 10 on a scale of 100 and improved the overall fit of the boot.
Yesterday I got some of the newer model Intutions with the conventional tongue setup for my Salomon Pro Model Gun boots. They probably stiffened them up about 5 out of 100 and they fit GREAT! If anything I like them better than the wrap version. The tongue is a little softer and the material is a little smoother than the wrap model I have. The wrap version isn't rough but I found after 3-4 days my shins were a little tinder. That would not be a problem for a weekly skier but since I do 3 -4 flights of 4-5 days at a time over a 4 month period my shins never got the chance to really toughen up. I liked the fit so much that when I had the chance to try the new model with the tongue I jumped at the chance.
I would recommend that anyone with older shells in good condition, that are the right size for their foot, consider a heat molded liner as an alternative to a new boot.I don't' think I will ever go back to a conventional liner.
One of the keys is to realize you do not need to tighten your boots to get a secure foot hold. The liners fit your foot. Buckle the boot to give you the forward flex you want and you're good to go. I know there are similar products on the market and from what I've read most do a good job. Some work better than others for specific foot issues and performance requirements, but for me the Intuition is hard to beat.