My pm wanted me to get one and I wanted to wait until after I got new MRI, etc. he agreed.

I can say that when he was advocating for it he said that it either works or it doesn't. If it works it can be to varying degrees. So I said anything goes and laughed. He just smiled so I'm not surprised to see such varied responses here.

I would reckon that's why there's a test period prior as well as psych evaluation, etc.

Whatever you decide, I wish you well. I have a feeling I'll be right where you're at in this decision sooner than later.