What The Puff! is highly praised for its crispy, generously filled curry puffs with authentic and flavorful fillings like sardine, cheese, and char siew. Customers appreciate their fresh, handmade quality, innovative flavors, and affordability, often comparing favorably to established brands like Old Chang Kee. The stall attracts long queues, especially during peak hours, but is valued for its quality and service. However, some reviews mention inconsistencies in pastry thickness and fillings, as well as long wait times. Overall, it is regarded as one of the top curry puff options in Singapore.