They are really nice but the thick lush ones are considered to be an invasive species. They look great in large drapey clusters but in some areas, they cover everything!
Perhaps its the colder climate here, but anywhere I've seen them, they appear to be well under control. I have a spot that would be self-limiting either way.
I looked it up once, and there are two kinds, one native the other not. The native one is a little spindly in comparison, with smaller berries. It's the invader that goes wild and looks so lush. Maybe you don't have too many of them yet.
I only want one... and another invasive shrub/tree - staghorn sumac. They can't be any worse than the palnt I'm currently trying to exterminate. I haven't been able to identify it, but it has a tap root - when its chopped into pieces, it STILL grows new plants! GRRRRRRR
Those are the kind that I drench with poison. If it is a brush I will even drill holes to put the poison in. It seems to be the only thing that works with some really hardy ones...