With the Mach1 110 MV from Tecnica you still get the C.A.S liner that comes in all of the higher end models and which makes the boot fit and ski way better. The boot will have no problem controlling most all-mountain skis out there and in the Mid Volume (MV) fit it'll fit most feet too. With a mid-volume fit as long as you're not narrow or super wide it'll make sense on paper, and while you can't tell without putting your foot in there what we can tell you is that you are in a shell and liner that is more anatomically correct. There's more room on the top of the foot and on the instep than most boots in this category and the shape of the toe box make them feel slightly longer as well, both of things are nice because those are two common trouble spots that are harder to stretch afterwards. So if you're in an old pair of 10 year old boots, the Mach1 110 MV is probably going to fit better.