Parked here last week while on a short vacation to LA (i.e. 2-3 day), and my experience was very good overall.
Even without making a reservation beforehand, I was able to roll up and park here without much trouble. Once I’d found a spot, which wasn’t difficult, I got a struck of good luck as the driver spotted me on his way to the terminal, and he was able to pull up right by the car.
When I arrived back in Oakland, the driver was waiting for everyone exactly where we were dropped off in Terminal 2. Even better, he promptly departed back to AirPark after we took our seats even though there were only a few passengers on board.
Overall the experience was easy, quick, and painless. Hopefully, when things are more busy they’ll still be able to maintain that same level of service and promptness.