In response to Werekong's PM prompting, I realize I owe everyone a 9.12 assessment, following up on my prior 9.16 review this fall.
I (weighing a mere 145lbs.) skied a 170cm 9.16 (the first-generation 9.16, although it's pretty similar to the current 9.16) for the past two years. I remember how shocked I was that a ski so short could not only be so quick in the race course (which is of course what I expected) but also so versatile all over the mountain. Now I obviously continued to use my 10.22 for gs, and my randonee setup for backcountry and out West, but for typical New England conditions, the 9.16 was my first choice, and even for atypical New England conditions (i.e., much of last season), the 9.16 was also quite good.
This season, the 9.12 in a mere 150cm is more of the same. The first day out every chairlift ride was a novelty, swinging my skis and staring down at their length, or rather lack of length. (Looking down while skiing proved to be too terrifying!) I was amazed out how I could make arc-to-arc sl turns on steep trails, turns that on prior skis required lots of pivoting. Yet higher-speed larger-radius were still stable. And moguls are lots of fun (both the springtime bumps I had one day at Bromley, and the powdery soft bumps I somehow got lucky enough to ski at Killington and Wildcat).
My big caveat would be skill level. The better you ski, the more fun these skis are. At the same time, they also make better skiing easier. So if you're already at the stage where you're acquiring real carving skills (be honest now), these might make a great advancement tool. Otherwise, well, who knows, maybe you'll still like them? I went up the lift with a guy on 167 Rossi sl race skis, who raved about their performance. I watched him ski off, making a mediocre version of the kind of turns I did 20 years ago on Rossi FP slalom skis. I was puzzled that he liked top-of-the-line new school sl skis for mediocre old-school turns, but whatever works for ya...
P.S. In another post, a review commented that seemed dead. That might be related to the rather uninspired lifter on the standard ski. (The race stock 9.12 comes w/ the 10.22/9.16-style plate.) But I'm not really sure that liveliness matters anymore for sl skis, since the whole point of "new school" sl is to keep the skis on the snow and go arc-to-arc. Yet then again I haven't skied on the race stock 9.12, or the SL 9 and 11, so maybe I would change my mind if I tried those.