As near as I can tell, there are three possible ways to achieve canting in ski boots.
1. In the boot but using canted footbed shims. See http://www.footfoundation.com/SKATING/skiing.html
2. Grinding the boot soles to the prescribed angles and shimming to get toe and heel pieces back into spec.
3. Shim the bindings.
What are the pros and cons of each method?
#1 seems like would be the cheapest/easiest but does it really work? First time I have seen this is yesterday.
#2 you can change to other skis no problem, you had better get it right the first time, but those boots are now yours baby!
#3 Reversible but you have to do it on all your skis and you can't step into someone else's for a test (well at least not with canting of course)
Are there any performance implications associated with each? The good, bad and ugly?