i had this one that took 3yrs and now i graft from it. It was fruiting at about 5ft tall in a 3 gal pot...and it was like every flower that formed set a fruit.
Since then the tree has got larger (the mother died, but a grafted one I have is alive)...and it gets covered by ants which wreck the crop (scale bugs mostly actually do the damage, they cover the flowers entirely)...
but when the tree was happy it made so much fruit it was amazing...
other ones i grew didn't do the same, they'd grow up to be really big, and have lots of flowers that seldom set any fruit.