I love mine.... sits in a pouch on the rack in the back of the 4Runner, use it, and charge it quick on the inverter and forget about it until needed again. Beats having to run a second battery.
I also have the 10a charger I am about to install. That way I can plug in the rig and let it trickle charge while at home, or i can top off at a camp site. They make a plug mount that is pretty slick so I can just hook up to shore power.