I have used Progressive's Snapshot three times now in order to get a lower insurance rate for myself and my wife. One of my most popular articles describes how to beat the system, in a sense. And it works, too, not because I scam or cheat or hack. It works because I consciously drive my best when I have the device in my car.
Florida has expensive car insurance. I'd recommend shopping around. Progressive may not be your best option, even if you can save 15% once you let the Snapshot spy on you for a while.
If you drive like most people in Jacksonville, don't bother with a Snapshot. It can actually increase your insurance if you drive like you're trying to outrun Rosco and Enos.