I've always recommended Randy's Mobility. They have great customer service and will bring the ECV to your resort and pick it up at the end of your stay. www.randysmobility.com
Pop on over to the disABILITIES forum here on Disboards & you'll find all that you'd ever want to know about ECV rental both at WDW and from offsite vendors. We'll be VERY happy to help!
I got mine at the front gate of each park. I only needed it for the parks, not the resort, so, it worked well for us. It was not an experiance that I would like to repeat.
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