We haven't stayed in the Rush, just the Carson (still the South Tower in my mind) and the Gold (North). I have read that the Rush is all nonsmoking -- is that what you found? That would make it very attractive if so.

And now that you mention it I haven't seen a line at the Rush check-in desk when I've gone by. The regular check-in line for the whole property, on the other hand, can have you standing in line for 30 or 45 minutes or more.