I've used park n fly a few times now. Frugal me always uses the economy lot, booked online in advance to get the coupon to use on exit. Those wishing to pay more can drive in without a coupon and pay full blow. At the parking lot itself, the entry and exit process is fully automated and intuitive, which is nice, and it works as it should. The shuttle bus arrives as promised and drops you right at the appropriate terminal entrance. I'm only docking a star because the parking lot is in need of a fresh pave job and because the last shuttle driver drove as though the bus was a Ferrari.