Is midnight limo new? I have not heard of that company before.
The only word of advice I would give you is check out each company and ask this board who has used and experience. I seem to recall some bad press about happy limo last year.
I have used Tiffany Towncars and Yourride. Tiffany went through some growing pains and had some bumps in service. The ride was fine, but I never had the same driver that dropped me off pick me up.
I switched to yourride last year as they were a sponsor on the board. I am thrilled with their service. I have had the same drive on all of my trips and I always request him. It is so nice to see a familiar face at the airport. Excellant service is always about the driver.
And Mears, well I went on a very long tour with them once. I was able to see a few offsite hotels as well as quite a few of the Disney hotels. It took about 2 hours to get to my hotel. I swore NEVER again. Now, it is always a towncar, even if I am traveling solo. It is one of th few indulgences that I will not give up. I look at it this way, Ihave spent more on dinner than the difference between mears and a solo towncar. I also feel safer traveling alone (and with my hubby) especially when we arrive late at night.
Good luck with your decision!