Demoing isn't useful for getting a feel for how the different lengths ride as typically the demo tents only carry one or two sizes, and for me in particular they never seem to carry the smaller sizes. No where carries the 166 rocker 2 for demo. Typically when I demo pow skis I have to ride 180's and then hope when I buy the smaller size it works out. Which has been a successful strategy with every ski *except* the rocker 2.
If you look at the rocker 2 in profile the contact length is much shorter than most other hybrid rocker skis, and because it's got tapered (spoon shaped) tips no amount of laying it on edge is going to give you that full run length like you would in other rockered skis. I definitely think this is something to take note of before you buy them. Other all mountain powder skis would be fine at that length but the tapered tips means that extra bit of ski at the tip and tail effectively doesn't exist on groomers and hard pack, no matter how much you edge your turns.