I love the M free 99. My bro and I share skis and while we have quite a quiver it's often a battle who gets to take the M-free out (tho we can switch up after a few runs).
I am still blown away by this ski. My first impression was with how playful they are, softer tip and tail with the rocker, for butters, bumps, and float, but what I can't get over is their hold and ability to carve or power through crud. They have some power, snap and hold underfoot, and pop and play tip and tail. We have kept the edges sharp and have not used them as a park ski. More as an all-mountain ripper and jibber, though I can imagine them being a blast in the park.
Also in the past two seasons, we have put nearly 100 days on them and they are holding up well. Certainly can tell they have lost some of their power, but it's not even close to a dead ski. Overall: blown away.