From what I've read and understand...citranges are more useful fruits than changsha, despite the greater edibility of changsha.
Anything that has more cold hardiness than satsumas just aren't going to be great out of hand eating fruit. One of the real paradoxes is that most attempts to get better quality fruit wind up tripping themselves. US119 is less hardy than a normal citrange, and approaching satsumas, yet, the fruits ripen in January. Presumably you can still pick them mature, but no wonder it's the people from colder Mediterranean places that like this tree! Orange and Arctic Frost don't seems to offer all that more hardiness than satsumas, but has significantly inferior fruit. Etc, etc, etc.
While Mr. Texas is always too harsh--I think that Troyer is plenty edible, and a more useful fruit than, say, a wild persimmon or goumi. It's just not something that you grow if you have real citrus alternatives where you are.
One thing I sort wonder about is that, at least for the Atlanta area, US119 is probably a quality ornamental. Trifoliate orange blossoms suck, citranges are better, and the more genuine orange look/fragrance of the tree and blossoms really ought to fit many landscaping schemes.