This is one of the better AA lounges that I have visited in the LOTFAP.
It is relatively new as I believe that it only opened a couple of years ago and reasonably comfortable.
It has a reasonable selection of drinks (you will get drink vouchers if you have QC membership / QFF Gold status) as well as some food for purchase.
There are also shower facilities and internet access.
I have only ever visited the lounge in the morning after arriving in LAX from MEL.
If you are OW Emerald (QF Platinum) then the Flagship Lounge is even nicer.
Here is a link to the lounge details on the AA website
LAX AC