I have used both the Mears bus and a car service. Both worked out just fine. My issue with the Mears bus is that if you have more than 2 or 3 in your group, it's going to be cheaper to hire a car service.
A car service will hold up to four of you...one person in the front seat, three in the rear. It will get you to the resort within an hour of landing...stopping at baggage claim is assumed. If there is no baggage to get, it will take about 45 mins to the resort from the gate.
Mears will take up to 90 mins. When I used it, I had to wait about 10 mins to get on and then we made about 3 or 4 stops along the way to the S/D. It took me 80 mins, from gate to hotel. Could be longer depending on how long you wait for the bus/van to come.