Visited Yogurt Time about half an hour before closing while in Phoenix for work. As the other reviewers have said, it's tricky to find because the Google Maps location is a bit off. It's actually right on the street, while the map makes it seem like it's inside of the plaza.
It's a tiny place, but the employee who was working was super friendly, offering sample cups right away and even asked if I wanted the rest of the coffee they had brewed earlier because he was about to throw it out.
I got the yellow cake batter and white vanilla frozen yogurts - both were good (vanilla definitely better than the cake batter though). They have a huge selection of toppings to choose from and prices seemed pretty standard for self-serve froyo.
If I'm back in Phoenix again sometime soon, I'll be back!