I am sold. I have never relied on my alternator to charge my stereo back but have used a dual pro 2 bank charger. I use a blue sea dual circuit battery combiner. Going on 4 seasons with my blue tops and they are still showing excellent result under load tests.
I still think adding the Stinger Capacitor would be a benefit, but is not something I am going to do this year.
Here is the charger I am going to use. It will not be on board but will reside in my boat storage and always hooked up to my batteries. Want to get a bit more amperage for the golf art batteries. http://store.schumachermart.com/ssc-1500a.html