It seems that they are probably more hardy than 5star that drops its leaves under strong winter winds with negative temperatures.
They ripen earlier than their citrumelo parent, more or less at the same time that C.ichangensis clones that I have, although they flower two weeks after 5star. That could be advantageous when sudden spring freeze is common.
They lack the internal oils and a hint of poncirus aftertaste that is perceptible in 5star .
Nature of bitter taste of 5star and these hybrids is probably different. The bitterness of the ripe 5star juice when kept in the freezer overnight can be completely eliminated, while that of Ichangstars is still there. On the other hand, bitterness of 113270 is much less than that of grapefruit.
The perception of acidity of these Ichangstar is certainly less than in 5star juice that is sharply soar.
The disadvantage is the number and volume of seeds, although 123270 does have more juice than fully ripe 5star. Its size although variable, is ~30% less than the size of 5star fruits.
5star has unique , original fragrance, while I do not feel any aroma in 123270 fruits.
They are acid citrus that could be used as hardy lemon substitute for juice, curd and other culinary preparations.