Looks like a money loser, 280 watt kit is $800, stated savings appear to be overinflated. I came up with about $60 in power savings, extended battery life is probably subjective at best.
280 watt panels typically sell for $1/watt, the DC/DC inverter should be around $100, brackets, wire, fuses, etc, allow another $50 or so. Total material, around $430 to $450.
Now think about this, golf carts tend to be typisy on curves, so what do you think is going to happen with an additional 40 - 50 pounds added to the roof area?
Now having stated the above, there might be a case for the person who's GC is outdoor LOTS of hours, and uses it quite often (high mileage), this setup could extend the range of the GC.
I would take a 'wait and see' approach and wait for customer reviews and a more detailed independent review.
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Pennsylvania, for 60+ years, most recently, Allentown, now TV. 
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