not foul-tasting , i can safely predict
I didn’t get to test for brix but am confident it will attain 30+
as for our bok jo graft, it developed a strong upright earlier this year but was lopped off at the green tender stage by our howling spring storms. The old laterals produced a lot but also got de-fruited by recent stormy weather. Couldn’t help but continuously whine about year 2018, lol
just tell me if you’re interested grafting some burntridge’s contorted to your trees. As for the waiting, it is only painstaking if none of your trees are productive. Used to be overtly impatient with having to wait for named varieties to bear fruits, but now way more interested in developing new cultivars from seed than acquiring budwood of cultivars i never had. I mean, if just started planting jujus for the first time in my life this year, growing them from seed would be torture 
sept late is more of a jujube tart than apple tart, while chico is the other way around. Apples supposedly diverged from juju’s parents millions of years ago, and chico happens to have acquired the same apple-tart genes passed on to apples from their common ancestor/s.
and yes, sept late does ripen here at around mid sept, but never say never @BobVance . You have been getting many of your jujus to fruit consistently where you’re at, so negatory anecdotes shouldn’t mean much to you