To get my day started, I pick up a Starbucks-Venti-Iced-Chai-with-Almond-milk-and-a-pump-of-Toffee-Nut EVERY morning on my way to work. As I am usually right on time, speed and accuracy is important to me when it comes to my morning drink order.
I can only speak for the drive-thru experience, but this N. Rainbow location is the best I've found in the Las Vegas area. They seem to do a lot of volume and the drive-thru line is usually wrapped around the corner, but I've never waited over 3-4 min from the time I pull up to the time I drive off with my favorite drink. Usually I'm out in less than 1-2 minutes... literally. They are quick and in 3 months they've never messed up my order.
From time to time the speed can come at the cost of personal touch, but in the morning I'm in a hurry to get to work anyway. Thanks for the speed and accuracy.