I think they are basically beneficial. A bit messy along the eaves and other places, but not damaging. The sting is painful and aggravating, but other than pain and swelling I've never had any further reaction. I do know people who are allergic. I don't want stung and it's only a matter of time until either me or someone else gets stung due the location. Frankly I'm surprised they haven't hit me when I'm messing around the plant. I do that a lot. I have to try and eliminate it. Tonight, preferably.
