We used L&M last year for the same reasons you mentioned. I was not impressed with their fleet of cars. I have rented several times over the years, and the cars are pretty nice, new and clean.
L&M's cars were not new (the one we got had about 25k miles), and not in very good condition. In addition, there were extra charges that I was not aware of before rentine (like extra $$ per day for another driver other than a spouse).
On the plus side, yes, they are right inside the airport.
If I had to do it all over again, I would not use them. But maybe somone else can shed better light on them for you. Good luck!