We've been buying those Dominican avocados. The first ones, I don't know the variety, were turning brown on the inside as soon as they ripened. Now we have Lulas, also from DR, and they're perfectly fine and delicious with the sweet Lula flavor.
Franciscu, in addition to the Oro Negro tree, I have Simmonds and Day, so in a few years I'll have plenty of avocados for you. Now all we need is a spring-ripening avocado!