I have a nice young Cherilata tree that I grafted on cherimoya rootstock last year. Very vigorous. Will probably get fruit this season. Actually it set and aborted a couple last year so it appears precocious. I have started giving annonas 2 or 3 years before deciding on fruit quality. I have had several varieties of cherimoya were very average on young trees but become excellent by year 3 in my yard. Fino de Jete, Knight, and Dr. White did not perform well early on.