I've grown them for three or four years and have had more than I can use in the past. This year they were late and the fruits hadn't developed as much before the colder, darker days, and then the frost, came in. You need two plants for pollination apparently. Let them grow as bushes, flopping over, and there are easily 30 decent fruits on a plant.
The fruits are curiously sticky, with a grainy texture, and a citrus taste. I think they are better sliced raw in salad than cooked.
I probably won't bother buying seed again, but I may retain a couple of the many seedlings that come up if I've a space for them.