I use USA Transfers all the time both ways. I usually "adjust" my flight time by 30 min or so so I don't leave the resort so early. Always great service and nice vehicles both ways.
you should have said your flight was at 7:45 or 8 that way you dont leave so early and sit at the airport forever
You can change it; they are great about making changes. We originally booked our transfer in early Feb and just added the Walmart stop last week. Did by email and had new confirmation within like 15 minutes. Our flight is super early anyway so we'd just be missing sleep, maybe breakfast time - if breakfast is even open.
This is our first time leaving this late and we are not sure how packed the airport gets at that time of day. So I think we will play it safe this time around and just leave it the way it is.