The rave reviews for this place here on Yelp (and from others at home) are well warranted. Not only is the staff here incredibly friendly, but the donuts are fantastically delicious and surprisingly cheap.
Just one example: during our latest visit, we couldn't decide between two different donuts, and she threw both in for free to try, and both were amazing.
My only warning is to note the difference between cake donuts and the normal ones when coming here for the first time. I vastly prefer the latter!