Is that the ski or the skier?
Both.
I know many good skier who have AX as their DD. They kill it. No questions.
I also have seen and skied with many not so good skiers on AX.
The AX doesn't make really improve the skillset of the skier. They may ski faster on it because it's a smooth ski. They may feel like a million buck because they paid through the nose for it. But at the end of the day they are still the same not so good skier.
Just look around the forum.
I generally skied with lots of skiers during the course of a ski season. If I have a dollar every time a new guy say "I am a good skier. I ski fast." I would have enough to get several decent meals at Olive Garden*. Not saying Olive Garden is my restaurant of choice. Any generic chain eatery can work here.
My standard reply is "So you are saying, you don't ski well enough to ski slowly." That usually will piss them off to no end.
Take a much better skillset to ski slow well than be a SCUD on the hill.
Ski performance wise. The AX is a 78/80 front side carver. Any race ski and/or near race ski can and will leave it in the dust. They may not have the baked in baby seal skins of the AX that insulate and isolate the skier from the snow under feet. But they will toast the AX in terms of performance.
* Olive Garden. Been there once. Shall we say, not by choice.
**Full disclosure: I own several pairs of Stockli skis. Including a pair of AX.