What is everyone using? I'm contemplating buying this one.

The Battery Tender 2-Bank charger is a top of the line 12 volt 1.25 amp charger/maintainer using the BT Plus recharge profile. The BatteryTender 2-Bank uses micro-processor technology in a four stage charging profile to charge, improve, and float your battery so it is ready when your are. Constant current charging and regulated voltage patterns allow the battery to be recharged fully and safely without the fear of overcharging. The real bonus is that the 2-Bank is capable of charging two batteries at once.