Yeah, the reviews were bad, almost no one got them to grow, so I'm sure there where a lot of disappointed kids. Thankfully kids don't get as attached to eggs as they do live fish. When I was hatching my seamonkeys my daughter was kind of indifferent when there where no babies after a week. Now, after we've had seamonkeys for a year, she would probably be really upset if they died.
There where a few experienced breeders that where successful, though, and I think that's the only reason I would get the kit. I've bred Angelfish before, but they're nothing at all like Killifish or betta. I would like trying my hand at the My BFF eggs, but only after doing the research and getting the right setup. The adults I saw where just amazing!