PAUL - Glendale, CA
We've parked here several times before, and generally find it to be price-competitive, if not necessarily the absolute cheapest. Location seems to be safe enough; they have indoor parking if you want your car inside. Shuttle can be a bit hit-and-miss: you might depart for the airport in only 5 minutes, or it can be 15 or 20 (depending on when a previous van departed, etc.).
For returning from the airport terminals, pickup times can be a bit trying, standing there watching the sea of vans from other services streaming by ... typically, we've been picked up within approx. 15 to 20 min. or so. This time it was immediate (!) because the van was right out front as we were about to call. It had been called previously by someone else, so it was our lucky day. This particular driver drove (IMHO) too fast on the city streets; I hope he doesn't ruin someone's travels by putting everyone in a hospital in a crash. Also, this particular van does not have an intermediate step which can extend during loading, making for a HUGE step from street level to the interior level. It's a bit of a nuisance (at the least) and a genuine impediment for anyone with any physical limitations on movement.