It's nice that it's inexpensive and I can control it (for now). When my kids are older (teens), they'll have phones they can control more closely. For now, it's not necessary. The Firefly lets me program in multiple phone numbers (anyone I think they should be able to reach in case it's needed), up to 50. My phone and my husband's phone are accessible with just a single button. Emergency can be contacted with it's own button as well. There's a delay before it actually dials either Emergency or Mom/Dad to prevent accidental dialing. Though with backpacks, a book sitting on it might be an issue.
Today is the first day my kids will get a chance to take it for a spin. My son will be out with a buddy today, I'll be elsewhere. So, they'll both have a way to call home and I'll relax (at least a litte) about it.