Seems to be a bit slow and tricky to propagate from cuttings. 2 out of 3 cuttings died. The third one was well rooted a couple of weeks back, but is only now beginning to sprout foliage (after just over seven weeks). Looks like it will survive to make a usable plant, but not entirely certain at this stage.
Update: March 27 - Nope. Karked it. The stem ended up rotting from the bottom up. Good roots, but not enough reserves in the cutting to generate anything else. I'm starting to think that if a cutting doesn't look strong and healthy, with abundant new growth, after 6 weeks then you might as well pull it and chuck it, because that means it will never have enough guts to survive. They all seem to turn to rubbish if they aren't strong out of the gate.