Can't say from LAX but used it in SFO a month ago. Works the same way as in MCO but there was a different selection of cars. Your car selection will be based on the clientele that use National at that airport. SFO had a bunch of 4 door sedans, Honda's, Hundai's, GM, Ford. The executive row was pretty bare but there was an Explorer and a Land Rover Discovery in it.
At LAX you will have to take a bus to National (or any car company) But my experience renting there a lot in the past was that the selection was generally very good for cars. Very few, if any, minivans or large SUVs.
I dislike renting a car at LAX, I hate those shuttles. The tricky part can be finding the return location, it is not that obvious. Now I male sure to put the address of the rental place in my GPS, instead of just heading for the airport and expecting to see "Rental Car Return" signs that are easily followed.
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