Very interesting post, David. I use Bowden (from Arlen) saddle trees and I've been pleased with everything I've gotten from them. My opinion on the whole "saddle fitting" deal is that it's not dissimilar to the whole "equine chiropractic" deal...it's a con-game. I'm fortunate to not only be a horse owner, but I also have access to sixty or more head a mile down the road from me that I have free rein to work with at any time. I can test gear...bridles, halters, saddles, etc. And I take advantage of that. I've never hurt a horse in any way with any saddle I've built from any tree I've gotten from Bowden. I do not, and will not, use any of the plastic poly crap that these "high-tech" companies put out. I use saddle trees built from wood and covered in rawhide. They work, have always worked, and unless equine physiology takes on a drastic overnight change, I see no reason why they won't continue to work. And work well.
I would strongly advise anyone that is tempted to buy-in to the saddle-fitting, equine chiropractics, equine dentistry cons to do some research before taking the leap. Just take a step back and look at reality.