The problem is the inconsisency in how the law is being interpreted.
An article in the Orlando Sentinel from earlier this year reports that 13 people in Central Florida have "pulled the trigger" under this law:
...They killed six men and wounded four more. All but one of the people shot were unarmed. So far, three of the shooters have been charged. Five have been cleared; the other cases are under review.
http://www.orlandosentinel.com/orl-d...8.story?page=1
There is a reason why many Florida law enforcement officials and prosecuting attorneys oppose the law.