I like the Granada China a lot. At least that is what it is called here, in Mexico. It tastes a bit like passion fruit, although it is a bit sweater, and bigger.
I check if the fruit is ripe by shaking it. When it feels like something is moving inside, I consider the fruit ripe. Just cut the fruit in half lengthwise and eat with a spoon.
Other fruits I like a lot are: papaya, custard apple, and feijoa. The latter, also known as pineapple guava, I have not seen in Mexico yet, but I know the fruit from when I was living in New Zealand.
But at least the tree grows in Mexico, since Saturday April the 3rd, we saw a Feijoa Sellowiana with nice red flowers in the Jardin Botanico Clavijero, which is close to Xalapa.