Finally!!! My Evo LTE pulled a 4G signal near the Seatac airport while waiting at the cell phone parking lot. Got around 2Mbps down and 2 up. This must have been from Burien tower which is a bit on the far side from there, and much, much better than the 100-700kbps 3G speeds that I usually get - so the speeds don't seem too bad. Looking forward to seeing more coverage in the region!