AMP is great, but I don't feel that I shoot enough currently to justify the Return On Investment.
I consider electronics (tv, computer, phone, thermal scope, AMP, etc) to be consumables. They have a life span and it may be time based rather than number of uses. That factors in my ROI. Time spent annealing, absolute precision, mass production, were not factors for me.
Salt Bath was out for me. Looked to much like a torture method from Game of Thrones. Don't consider myself clumsy but it only takes one little mistake.
EP is working for me in my situation.