I'd love to hear results from arborists in the field, too.
Their marketing makes it sound too good to be true.
I attended a seminar by the scientist who did the study on the oak that is pictured in the ads that recovered dramatically over a few years. What I learned was that several trees were treated, but all the others were removed (for construction) before any recovery was observed. So, the study was based on only one tree. I need more than that to convince me.