Last month, I used Mears both ways. But, there were times that I felt Mears from MCO was so slowww.
So, once, I rented a car from National for one day, and since I joined the Emerald Club, I was able to pick a car and go.
The following day, I returned the car at the Dolphin resort, very easily. At the end of the trip. I made arrangement for a Mears pickup back to the airport. I don't mind the trip back. It's the trip to WDW that I hate waiting for Mears.
I plan on doing the one day rental again in November. I stay one night at a resort, moving into DVC the next day. I also will make a trip to Publix before returning my rental, so that works out nicely.