I haven't used Edmonton, so can't really say what they are like, but I have heard that people get good results there, costly though . . .
As far as the U of S, we haven't had good luck there in them actually finding a lameness problem unless is it glaringly obvious. They do a lot of tests and come up with nothing - the horse is 3 legged lame . . . called a friend that is a massage/chiro/vet tech/nutritional consultant, chinese medicine person with a lot of training in a lot of different areas - she nailed it down over the phone and later looked at him and confirmed it. We followed her protocol and he is now on 4 legs and looking pretty good at that . . .
U of S didn't charge us full price for everything since they couldn't find the problem though - so they were not really expensive . . .