I purchased my Prophet Flites in 179 towards the end of this season, mounted with the Marker Griffons, they are a fairly light ski...... I like them a lot. I am 6' 190# advanced intermediate, (it seems like a lot people think they are better than they really are), anyway..... Skiing both, the Prophet 90s and Flites, the 90s are quite a bit stiffer than the Flites, maple core vs poplar, and a metal matrix sheet vs a composite matrix (I assume a fiberglass/combo of some sort). In my opinion it takes a fairly aggresive/advanced skier to get the 90s to come to life and "CARVE" like they should on-piste, not "SKID". Per my ability, weight, etc.....for me the Flites came alive compared to the 90s. I would rather have a ski that works like it should most of the time and possibly fade here and there, than have a ski that is to stiff to perform most of the time and only works properly when I am really standing on it. I have had no problems opening up the Flites with big fast GS type turns, they hook up and carve great, and I had no problem with stability, again "carving" not skidding. I also found them forgiving, asorbing during the freezing crud towards evening after a warmer day, allowing me a more controlled run. I still think to many people ski to stiff a ski for their ability, that they are on to high a performance ski thinking they will progress into it, just my opinion/observation.
FYI.....the Prophet 100s are not quite as stiff as the 90s. Although they are wider and of the same construction, if you take a look at them, the metal matrix plate in the 100s has more cutouts, less of it.......who knows, it could even be thinner.