The last few times I've gone to the Wendy's on 4th South in Salt Lake City, I have been very happy with my service. This drive-thru is definitely one of the fastest ones that I've been too--and the fast service is consistent! I haven't ever had to wait more than a few minutes in line (due to a lot of cars) and once I place my order and move to the next window to pay, it is time to pull forward to the next one to pick up my food! My orders have been right and the food has been very fresh.
I do know that people are quick to complain about fast food restaurants (because normally there is something to complain about LOL), but I just wanted to give a hats off kudos to this particular location for their excellent drive-thru service.