Who has bought market leader leads? What is the result?

I have been talking to the market leader representative.  He has been helping me with one of my many websites.   I picked up market leader when I was crazy busy and they had a great promotion.   Now they want to sell me leads.  My first reaction is that I have been there, done that.   Yes you get a few deals once in a while but often the leads I bought were duds.   At the moment I have time (I think I got furloughed with the government employees)....

So the question to other real estate agents is have you bought leads?  What is the result?   Just wondering....