Government Tax Lien Network Reviews??

Hello Bigger pocket folks,

They are a group of real estate investor mentors that wanted $40,000 to provide some pretty sophisticated software and walk you through tax liens and flipping your first two houses. They were very knowledgeable and well they claim that within 90 to 120 days you would have your monies back from the first flip you do as they average $50,000. I realize education and mentors are expensive. University studies would cost that a year. This seems at first blush worthwhile and would jump start  your investments and retirement. Anyone have any knowledge about this company and is it worth it. Do they do as they say?? is it worth it?? Thanks for your feed back..