I travel weekly and have been for over six years. Whenever I'm in Phoenix I try to use this service and it's about a 90% fail rate. Today I arrived on time to check my luggage an hour and a half before my flight and due to the slow service at the counter I was 5 minutes beyond the time limit. I'm over this service and I'll save my tip money. You have to take a bus on a long-ass ride to the terminal anyway so no big deal.