Haven't had the pleasure of eating guabiju yet, but given its cold hardiness and periodic sudden blasts of cold in Florida that damage so many plants it's one i would definitely grow if i lived there, just because it's one you wouldn't have to baby. However i think it's even more appropriate in Southern California where winter weather kills so many tropicals.
BTW, this guabiju fruit is also found in northern Argentina and Uruguay, maybe also Paraguay?, not just Brazil. So it can definitely take frost.
I just planted a bunch of Hexachalamus edulis, ubajai, another one originating from similar areas. Also one i haven't tried yet. I noticed there was a tree of it in the Fullerton garden in California, but wasn't fruiting at the time. Have you tried this one Berto? How is it?