It's been 5 years since Chiranjit Parmar started me on the quest for this plant. I started a cutting from
TARS about 4 years ago and the plant has steadily grow to about a meter in size. It is doing well in my very mild winter climate where it might reach freezing for an hour before dawn about a half-dozen times per year. The leaves will get a little yellow and red blush during this period but overall that's fantastic for a plant whose native environment has a record low temperature of 45 F (~ 7C).
Since I started growing the plant, a lot of new information and research has come forward. There's a nice synopsis on Wikipedia, including the English name of the plant:
Conkerberry - Carissa spinarum.
I've had a couple handfuls of fruit sets on my plant. Its delicious, better than Blueberry in my opinion.