peace All,
I have debated on other forums. My experience has been its not effective in terms of gaining "reverts" (thats not why I did it, I'm just making the point). The desire to learn/inquire for oneself must be there.
However, it has been fruitful in terms of inviting those more moderate / free-thinking individuals to this forum to participate.
It is also good to let the traditional Muslims know that an alternative is out there.
Wakas