Yes, I mentioned in my original post that I would be borrowing two XPower units so that my MCS friend could try them out.
When she had the Graham-Stetzer filters installed in her home, she got worse, unfortunately, and had to have them removed within two days. It is a mystery why she reacted so badly to them. Logic would dictate that she should have been helped.
But you never know with MCS. I shall report back to this Forum how she responds to the XPower.