I've used them 3 times with no problems. Last time was in April. They are right at the airport and their lines are short. I will use them again. Bring proof of insurance (front page of policy) if you do not want additional coverage.
There are isolated cases reported here on The Dis about L&M not honoring reservations. Have some kind of backup plan ready just in case.
The adverse reports did not mention arriving at the rental counter late or not bringing proof of insurance or not having a printout proof of your reservation, all of which can result in legitimate cancellation of your reservation. One report did say that it was Daytona week or something and L&M could aways get fifty dollars a day for each car.