I receive scions of Mike Dohan from a third party labeled as Dream x Bumpo is this the same that you are talking about?
I have several grafts of "Bumpo's Dream" growing in Miami. Similar to a Cherimoya, they have an inferior heat tolerance to the other atemoyas that I grow.
One graft that I did, on an original Dream tree (from Wayne Clifton), took well in spring, then lost most of its leaves to sunburn in summer. This was the only branch of the tree where this was observed.
Shortly after grafting, a fruit set, with hand pollination. This fruitlet never grew larger than a pea and eventually turned brown and aborted.