Jim, heres what I posted to Brendan:
Brendan, I am on a 176.
The comparison is easy. First off, both are excellent skis, its just that they are two different kinds of skis. The 82 is 122/82/108, 17.7 m radius. The 82's are a sandwich construction race bred ski. It is a fairly damp, demanding ski that prefers speed although its not a true race ski. It excells on the hard-pack, rocks in the crud and is just fine in mogul, powder and even the trees. OK, sounds like the Mojo right? Yes it does all of that but just differently. The Mojo is a cap construction, 124/89/117 20.2 m Radius. Just looking at the dims shows that this ski is more at home on soft snow for sure. The Mojo90 feels super light underfoot and is noticeabley quicker and more nimble. Much more pop and energy and not as adept on real hardpack (although it does just fine with good pressure on the tips) The Mojo90 is a toy in the trees and moguls. It can be turned on a dime, you can carve it, you can slide it, (which you will need to do in back country conditions) it is great in moguls. With the extra pop, it is a lot of fun to play with in the bumps. I am not a park rat, but skiing in banks, rollers and small hits, these things are so stable and solid, you have much more confidence since landing on 89mm is so much more stable. In the trees, the 82's are fine, but the Mojo's just eat up that kind of terrain, much more float (without surfing on top) and so much easier to turn and really adjust to varied terrain qucikly.
As a wise man said (Michael Barrett) when I was torn over the 88's or Mojo90's, you will love both but if you get the 88's you will still want a powder ski. I now understand what he meant. There is a big difference between the two but both are fantastic at what they do.
Bottom line: Have a hard snow ski like a SuperShape, RX8 or Dynastar 11 and then a soft snow ski. I used to be a fat ski nay-sayer but now more I am really sold on fatties in the soft stuff. Can you ski a SuperShape in the Soft stuff? Yes, but the mojo was fun times 3!