Anyone subscribe to Amazon "Freetime"?

I'm considering replacing my 4 year old's tablet, and among the choices, I'm considering a Fire HD tablet. I'm a Prime member, so I can get Freetime for 3 bucks a month, but I'm wondering if it's worth it?I can't ascertain whether or not I need to be on the internet for it to work. I.e., if we go in the car, suddenly Freetime doesn't work.Does anyone here have experience with this service? via /r/Parenting http://ift.tt/2m87L9L