Keeping sites I've set up for friends up to date has been a trial. I'm happy to say this is no longer true. I've got this plugin running on all my sites, even ones where I auto-update core myself, because I feel confident in updating themes and plugins automagically.
If you, like me, carefully vet and test every plugin and theme that goes on your sites, this is a perfect plugin for you. Use it. Love it. Rate it.