You know, I think learning Perfect Turn as my first experience of teaching (last year) has stood me in very good stead, especially when teaching beginners. I find I am teaching very differently from my colleagues at Keystone in this regard...doing all the boot work, and one ski work, in a targetted way. I see the others putting their people into 2 skis very quickly and taking them up the hill to teach them breaking wedges (snowplough, really).
About a month ago, I decided to go back to full PT teaching, so that with the students' first or 2nd glide down the hill, they were turning already. I've found that getting them turning so early has them doing it much easier...rather than getting them settled into wedgeing straight before introducing turns, which makes them seem difficult.
If they turn as soon as they start experiencing gliding, I have found it comes so much more easily. And then turn to stop, and then the hill is their oyster!
I think that for lower levels, PT is a very good system indeed. Vail resorts, based on my experience here, don't really have a system as such. There are lots of people of varying ages and experience, and they all teach their own way (me included). I think the people who take their groups high up the hill to start them off are wrong, but since they are teaching breaking wedge anyway, it probably works.
I'm not very impressed with the new PSIA manuals, either! Lot of new age stuff, but nothing of substance, why they include Myers Briggs is beyond me, that is such complex stuff, you need a book and a training course to start to understand it. I think the old one copy manual was more meaty.