They're nothing to get all worked up about, really. They're very docile and have no interest in humans at all, and don't bite or sting. When they start to fly they do fly into you but that's only because they're dozy, by then you'll be so used to them you'll just pick them off yourself, no problem.
My wife was totally freaking, but has calmed down a bit now she's seen them. Little Rory likes them.....