I like the dual pro chargers,but they are top of the line and expensive.dI have a 3 bank I've had since spring of 98 and it's still going strong without any trouble.I can say I do not like the Schumacher onbooard chargers,I have a 3 bank,because it was about 100 dollars cheaper than dual pro,and I'm on the third one under warranty in less than two years.They exchanged them without any hassle,but I don't know how long they'll continue to do that,I don't remember how long warrenty is.They make excellent chargers for the auto industry but not the marine industry.I don't keep them hooked up full time any more.