Has anyone tried Dr. Ruff's new online assessment?

I'm thinking about it and wondering if it will be very helpful or not. I'm hoping it would help me decide where to place my son gradewise next year in different subjects, and I'd like help knowing how fast he can go through grades. We are in a public homeschooling program and II really have the option to do whatever he needs. But I'm unsure of what that is.
So I'm wanting to know if the test would be helpful and worth it for me.
http://talentigniter.com/ruf-estimates