It worked fine for us! We arrived at 9:45am on a Wed. and were through the airport and to the counter at no time. No line to check in. They didn't find us in their computer even though we had received our packet, but they just called to verify with the baggage people that we had three bage checked and to look out for them. (We used the yellow DME tags) We got on the bus and that is when we had to wait. I guess we waited almost 30 minutes to leave, but they were waiting on passangers they knew were arriving around the same time as us. Since it was free, I didn't mind waiting, but if I'd have paid I'd have been disappointed. We stopped at SSR before arriving at POR (which was fine since I wanted to see it!) and checked in with minutes. When we returned to our room around 4pm, our bags were waiting!
For our return, we had to leave POR at 5:25p for a 8:25p flight, but again, it was free, so no big deal. All in all, I was pleased with the service!