Amsoil is a great product, based on what I've heard from friends as well as the UOAs posted here. But I think what's happening is that other oils are "catching up" with it performance-wise, and that's beginning to make the higher cost of Amsoil look like you're wasting your money by buying it. Of course, if you factor in the longer OCIs afforded by using Amsoil, the cost comparison gets much closer. But there's something a little scary to me about running the same oil for 20- 25,000 miles.
I just put the ASL in my truck 1000 miles ago, and I'm thinking 10k is as long as I want to go with it. The question is, if I do that am I getting the full value from the product? Of course, you have to define "value". Moneywise, not so much. But I really like the idea of putting the best oil in my truck, even if it ends up costing a bit more, and I get perceived value from that.