IPv6 -- BFLETS/Hikari Fibre Question

[FG Lurker]

I haven't done a lot of research about this yet, figured I'd see if someone here has already been through it already.

Yesterday I stopped at one of those ubiquitous NTT BFLETS sign-up kiosks and asked about getting Hikari Fibre put into the house. They went through their speel and explained the various options.

I asked a bunch of questions which the first staffer couldn't answer. She pulled out someone with more knowledge, and it turns out that the new Hikari Premium that NTT is pushing is IPv6 and requires you to use NTT's router behind the ONU. Their router splits off various services -- IP Telephone, TV, Internet -- and works as a NAT box providing IPv6 to IPv4 translation, giving internal 192.168.x.x IPs to any machines in your house.

Does anyone have experience using Dynamic DNS services with IPv6? How about connecting with SSH to a firewall behind the router?

Any thoughts appreciated.