Exactly the question I asked one of the locals here when I was thinking of planting one. They won't hurt you, she said, but they're not very nice. I planted a vine. In the ground. And regretted it. It took over, not only spreading like the plague, but also popping up out of the ground up to 20 yards away. I thought I'd dug all of it out last year. This year it's raring its head again.
Never again in the ground. In a container, perhaps, because the flowers are lovely.