Growing good loquats from seed is unpredictable--you might get lucky, and you might not. Several years ago, a fellow fruit grower ate some great loquats at a restaurant in Spain, so he pocketed the seeds and brought them home to plant. He gave seedlings to anyone willing to keep them till they were mature enough to fruit, so I took one and planted it in the yard. I don't know how the others turned out, but the fruit on mine isn't very good, and it seems prone to what is probably fireblight. I keep thinking I should replace it with a named variety, such as 'Champagne,' but haven't gotten around to it.