I think it should be a must for anybody who has a child under 8. You are hopeful you will never be a parent who get's the call your kids been missing/kidnapped, but it can happen to anyone, you turn your head or trust someone for a split second, and next thing you know, your child could be gone. I watch my son always, but you still just bever know. I do not think that these things should be used for spying though, but also there are ones that track speed, and I think it would be nice to know how fast a teen is driving when they are alone with friends also. One parent said their child would talk the kidnappers ear off and they would beg to give them back, but lets be realistic... that doesn't happen