I have quite a lot of Vanilla vines, for me they grow fast and flower prolifically. Occasionally stems get broken and these end up as new plants. But I haven't got around to pollinating, wouldn't have time (or patience) to process the pods. And mostly the flowers are too high up and out of reach. That's one thing you need to keep in mind if you do want flowers, they won't hesitate grow to the highest possible point before flowering.
Also got the pepper vines, but they haven't flowered yet. They grow easily from cuttings as well, although, slower growing than the Vanilla. And I think they like stronger light than Vanilla.
And the other one I have is the Cocoa, two small plants which are growing well. I like colour of the new leaves before they mature. A friend has one which has just started fruiting.
The other two I don't have, you don't often see Cinnamon trees for sale here. Cardamom is fairly common though.
Thanks for the interesting article. It's nice to have plants that look good and also have some other utility, especially the promise of home made chocolate :O)