I don't really care for them, I'd by far just prefer to watch the real thing.
In saying that, I don't mind them, so long as they don't claim they're as good as the actual man nor get plastic surgery to look like him. Like really, if you do that you seriously have issues. The fact you're so utterly deluded and obsessed with a man to spend tens of thousands of dollars to permanetely alter your face, essentially striping yourself of your own personal identity, to look like a poorly done, artificial imitation of Michael Jackson is legitimately concerning and disturbing.
Like if I was Michael, I would actually be disturbed to some degree by that. If you're really good at your impersonation, your face should be irrelevant.