Che is also called Mandarin Melon Berry. It is a distant relative of the mulberry. One of my trees actually produced some ripe fruit the year before it died, so I've had a chance to try it and found it very good.
Here's a link with some good information.
http://www.crfg.org/pubs/ff/ch...
In my zone, the fruit is just ripening in early October, so there is some luck involved in getting a good crop before serious frost. I have my surviving tree in a very large pot so I can move it for the winter. It goes up against the side of the house, near a cracked basement window. (I have to use a dolly) I pile up bags of pine bark around it on the 3 sides away from the house for insulation, then move it back out to a sunny spot in the yard for the summer. I was sure it would fruit this year, but it did not. It's big enough. It's kind of a mystery tree. Grown for a long time in human cultivation, but not a whole lot is known about its biology.
If you are in zone 6 or higher and interested in a fall bearing fruit tree, give this one a try. Edible Landscaping has a variety that sets fruit without a male to pollinate. Pretty tree as well, but does have thorns at times.