Review (5/5): Surprisingly good
I'm getting kind of tired giving up quality or utility for responsibility. These seem like they fit all cylinders.
The handles are comfy. The bristles good. (Black is a tad funky, but what can one do? At least I know no one will use Dad's toothbrush.) The cardboard inner boxes might be considered excess packaging but at least they are unbleached paper and not a poly-byproduct.
I say go for it. Especially if you name your kids 1, 2, 3 or 4 since they will then have personalized toothbrushes. (And if anyone can figure out why they number them, I'm all ears.)