I was just approached about this. It was the first I had ever heard of it so I started researching. Doesn’t look like a wise path. I wouldn’t personally use or recommend it.
Read this as I found it very encompassing.
A good number of years ago, they were at an IDEA conference and presented themselves there with a formidable marketing force. Glossy brochures, powerful presentations and a bait to trainers to divulge their clients’ contact information against a considerable amount of money (they even promised that they would keep their source anonymous).
This to me was very unsavory. The stuff they sell is very expensive and therefore only for a select group of people. While I told my clients about it, I also talked of their marketing.
At that same conference, I also asked a very respected presenter about them, and he was very critical.
When I am asked about it, I do not recommend it or recommend it but relay the same information I just wrote here.