I haven't heard much that's positive about the taste of Black Jack. If it's going to be a potted tree you could always keep it pruned to the size you want since most figs produce on the current year's growth. In my mind there's nothing wrong with the more common figs available at online nurseries: Hardy Chicago, Improved Celeste, Stella, Atreano, etc. Petals from the Past has been a good nursery for me. Good prices, reasonable shipping, nice well-rooted 1 gallon plants.