I updated mine, which is the US WiFi only version and started having problems with it immediately. It worked great for the 1.5 years or so that I've had it, but the new screen fonts were too good to pass up. I'm currently trying to work those issues out, but wanted to warn anyone with a similar device. I would recommend waiting a few days / weeks to see if the problems are fixed or widespread before allowing the new update. More info about the update is at the link.
If you don't know what a Kindle is, then you have no problem. Don't worry about it
Edited by walla299, 17 September 2012 - 04:21 AM.