I unfortunately can't recommend them at LAX. I have used Dollar over 20 times at MCO and never had a problem, since joining Express the service has been even better with very fast service and free upgrades.
Twice rented at LAX, 1st time very slow service(before I joined express) all going well until I said no to an upgrade, went from a freindly, charming salesman to an arrogant, horrible man.
2nd time I joined the Express line, took longer than the regular line. I wished I had moved across as when we got served the woman was as bad as the guy we saw on our previous visit. She literally threw the docs across the table and said "she signs there" referring to Karen. I have no idea how she kept her cool, almost exploded that rental.

I know I could have got 2 bad reps but I doubt I will try them again if we go back, too many others to use, Dollar are also offsite at LAX (not sure if any are)