The Feijoas I have attracts both bees, squirrels and birds because of the flower pedals. Not sure if many know this, but the flower pedals are sweet and also very delicious! So because of this, I think feijoas have no issues self being pollinated.
However, I do have 4 trees and its 2 different types, an oval fruit and another that is a complete round ball. The both are sweet, but the round one has less tart and appears morw sweet. Both delicious.
The only other feijoa i have had not from my property is one from hawaii. To me that one is below subpar. Not sweet, mushy texture, giving me the impression of a spoiled fruit, but it was not.