Those Kastle skis were very, very good. As a group, each ski I tried from them was MONEY, in more ways that one. $1500 is alot of $ for a pair of skis, no doubt about it, but I think that they are delivering real performance that, for some people, may be worth the investment. Exceptionally smooth, yet extremely powerful with a very even and predictable flex and forgiving nature. And, as stable as anything else in it's given length. Not that my father-in-law has ever let me drive his 507hp, $115k Mercedes CLS63 AMG, but if he did, I bet it would handle and have power similar to one of the new Kastle skis.
If I had to sum it up: each of the Kastle models probably has 1 or 2 competitors that are as good. Head might have a ski that rivals Kastle Model X, Volkl a ski that rivals Kastle Model Y and so on. But, no company except Kastle has as nice of a lineup: each ski is a home run.
Now, whether a pair of skis is worth $1500 is another matter. You could spend 1/2 of that and get nearly the same performance, and have money left over for a ski trip. It is probably the same as in any other sport: is a $8000 bicycle really much better than a $4000 bicycle, or a $50,000 stereo better than a $20,000 stereo? Yes, but marginally, and it would take high level cyclist or an ex-musician to really appreciate the level of performance each of those top-end items bring to the table. Just as if you are a skier and a hack, you will be a hack on any ski. Money is better spent on lessons and time on the snow for a hack (or most anyone). The point of diminishing returns has been passed when you reach those upper price point levels, and value becomes pretty subjective.
If you had $1500 burning a hole in your pocket, you could do a whole lot worse than a pair of Kastles. Alternatively, you could get a sweet pair of basically-custom boots and alignment that would do much more for your skiing than any pair of skis every would.
Then again, who am I to tell people how to spend their money?