Re: if at all
Many provider still see it as a problem, not a solution. But Sky here in Italy announced its FTTH will be IPv6 first - MAP-T will be used for IPv4.
I had to use Hurricane Electric tunnel service to try it in my network. It handily give you a /48 prefix to play with if you ask, but it still means you're connection to the internet is in one of its tunnel gateways - although you can choose where from several locations, and you still tunnel all your IPv6 traffic through HE systems.
The worst thing till now is ISC DHCP support for IPv6, having to run two separate processes both needing updating Bind is not as smooth as it should be.