I have a well established guanabana, and I feel Harry's frustration. I have no Idea regarding it's variety, etc.
It was planted by the previous homeowner (I moved in in June 2004) , and it fruited big time pre hurricane Wilma(Oct 2005). 30 plus very large fruit, maybe up to 10 lbs. This was before I knew anything about tropical fruit, and I had no idea what to do with it. I ate some, and wasted a lot in my naivety. I remember it being of a sweet/tart flavor, having a moderate amount of seeds, and fairly fiberless. I assumed it would have heavy production annually. Boy was I wrong.....
Zero fruit since Wilma. Maybe I'm not taking care of it well, or maybe it's just the weather patterns holding it back. Regardless, I have hope that someday it will fruit again..