Haven't used this. Somehow, I tend to get lucky and don't usually encounter long lines. I did get stuck in one at TI several years ago. And one at Paris a few years ago. But I was just at the Nugget and there was no line. Of course, it was kinda early. Like 11:00 AM or so. And I was in the Rush Tower. Right from teh town car into the lobby and to the desk. No one else was there. Checked right in. Got a room too. Nice and easy.
Have you stayed at the Rush Tower? I highly recommend it.