I have a 6 year old Durazno Bonanza peach tree which sort of had brown dots in the flesh and premature dropping of fruit last year. Don't know what caused it, and that was going to be it's first big harvest. The few peaches it did mature were by far inferior to my Elberta in every way. The Bonanza tree is a natural dwarf and something of a specimen tree with unique growth pattern and flowers, so I guess it stays but I probably wouldn't plant it again.