Not the worlds most sour. Skittles sour in the green bag has much much more intensity than the Mega sour apple.
The candy itself is good, like a regular warhead, but the fizzy stuff in the center is utterly disgusting. It's kind of salty? It's hard to explain but it's so nasty I couldn't finish it and hand to throw it out. Yuck! I thought it would be more like Zotz... I miss Zotz...