I had a fire. My wife is on her second, after having software issues. We have found that while it does have nice features, it doesn't do a number of things we wanted very well at all. For instance, it has no safegaurds against my 4yr old surfing an internet porn site (I still can't figure out how he did it). There were also no safeguards against my 4yr old buying apps and games that he thought looked fun. He's smart, and figured it out on his own. Also, I could only observe this site, but could not post, since the fire would not highlight the text windows on this site. That was the last straw, so I returned mine within a week for a full refund. Mine also had a defective speaker, which is a widely reported problem. Battery life isn't very good, either.
Since their release Amazon has issued an update which allows you to password protect access to the net, but still no content filtering, or purchase protection (your credit card is stored in your account info, so anyone holding your kindle can spend your money.
I'm waiting untill the next model comes out in the spring with a bigger screen, better battery, and improved software. I'm also open to another brand, if the features are improved.