I have enabled it on customer environments, its nice because it does away with DHCP. Your machine wakes up and sends out an ICMP message asking for the auto-configure network. Then it takes its own mac and makes an IP address. It only uses that address to communicate globally, it has a local address as well. Also, it builds a 24 hour security address if needed. It does some very interesting stuff and is so much better than IPV4.
The problem is using things like PING is a PITA, 128 bit addresses are crazy big.
I am looking to get a job with a company that is using IPV6 for communication because they are putting millions of devices out there. I have some experience with it, have deployed it and written courses on it, but the uptake seems really slow. Its funny, the answer is out there, not one is using it.