Dwagcatching says the 106 is better in the bumps, and the 108 is better everywhere else. No carbon in the 106, so its heavier and damper. I get the feeling its more of a wide GS ski, and I think the radius is longer on the 106 too.
Trying to narrow it down between the 106 Ranger (190), Belafonte (186), or Cochise (185) as a replacement for my beat up Legend PR 105s. I have skied and liked both the Belafonte (186) and Cochise (185/193), but not the Ranger. It might be the softest of the bunch.