Zoyo is the best froyo option in the Ahwatukee/Chandler area. The flavors are all really good, topping selection is great, and the people working there always seem friendly. I take my daughters here at least once a week. They love it.
The only thing stopping me from giving it 5 stars is that it seems like they've stopped rotating in new flavors lately. For the past couple months, I've pretty much had to stick with a mix of cake batter and oatmeal cookie, which is good, but I'd like to see a few flavor changes like some of the other places in the area.