I have some near new Atomic Hawk 100s with Bizzard Brahms 173 88's (love the skis). I would not describe myself as a good skier but I am a bit of a natural with leg strength balance and nerve, so I am improving very rapidly.
The shop said that stiffer boots would feel like blocks of ice on my feet.
A friend who is a very good skier (better than I will ever be) insists he can't teach me to ski with 100s and I need at least 120s to feel the skis.
I am very interested in any other perspectives.