The top reason is "Service". These guys go out of their way to see that you are taken care of if you use one of their chargers. When I changed over to the gel batteries, I called them and asked about the needs of the battery v's the specs of the charger. I didn't talk to a phone girl or worse yet an answering machine, I talked to an engineer who understood my questions and knew what had to be done. They needed to swich the cards out in my unit to another type. Now, most modern electo gizmo people would have just told you to buy another, not these people. I sent them $80 and a return UPS label. For that, I got 2 new cards installed, They re-waterproof sealed the unit, re-painted the unit, installed a new cord since I had clipped the 3rd prong off the plug :? , packed it in a brand new box just like a new unit from the factory, and mailed it back to me. All this in 8 days time from my office to theirs and back.
When you find another charger company that will service their product like that, I will consider changing.
Skipper