I usually ski in a 130 boot but that is more so because brands tend to overstate the flex index on their boots. After trying on the S/Max 130 Carbon, I could instantly tell that it was a bit stiff for my liking. If I was only ripping frontside groomers and not cruising, I would likely have gotten the 130s. These 120s flex like some other brands' 130 boots so I definitely recommend giving these a try if you usually stick to 130 flex boots.
They are definitely a low volume fit but the custom shell helps ensure that you will not be in pain. The only word of caution I have here is to pay special attention to your instep when trying on these boots. If you feel pressure on your instep/navicular, it could be tough to expand that area of the boot because of the seam. If it just slightly bothers you, I recommend adding some padding to that area when you go to mold the boot. Ultimately, talk with your bootfitter and figure out if these boots will work with your foot/skiing.
Back to the volume conversation, I was not able to fit into my boot with my medium thickness footbeds. I have a low volume "race" pair that fits well without having to grind down the footbed or bootbard. If you plan on using an aftermarket footbed, I strongly recommend trying these boots on with that footbed before you commit.
On the hill, these are great. Stiff enough to drive any ski you get on but can also handle bumps or chatter without much trouble. If you are looking for a powerful boot to take you all over the mountain, look no further. These are the ticket.