I've got one of those Black Jack's and the fruit is a pretty good size for such a small tree. This is my first year with it in ground in California's high desert area (Zone 8b) and so far, with a mild winter down to about 18F, it's fared well. As far as taste, I don't have alot to compare it to (I've been growing Brown Turkey, Black Mission, Black Jack, Kadota, and Janice Seedless). It seemed similar to the Brown Turkey, but with a larger fruit -perhaps it will distinguish itself more as it gets more established. The grower that I bought it from is very conservative about the varieties he'll offer in the area as the dry cold, late frost, and intense summer heat leave most folks opting for rock landscapes and cactus -so, what he does offer, he tries to make sure is nearly bulletproof in our climate. In any event, without much care, the Black Jack seems to do well. I'll have more to compare it to later this year as I caught the "fig bug" looking for another Janice Seedless and a few months later find myself rooting over 60 different varieties and planning trips around where I can see and/or try new varieties.