We harvested a jackfruit today from our Cristela and it was delicious. Sweet, crisp (for a jack), relatively easy to peel.

This tree is very precocious and produces small jacks. It doesn't put as much energy into growing in height as it puts into producing fruits. It has remained a compact little tree, at about 6.5" after a few years in the ground. So for those who want jacks without devoting a lot of space, this may be your answer.
In the picture above, the jack is next to an 8" chef's knife. It has set 6 fruits this year, all at the very base. Last year it set two fruits when it was only 5' tall! I harvested those too early, and so wasn't able to taste the fruit until this year.