Over the last month or so, I've been playing with Internode's IPv6 offering. My platform of choice is my Linux-based gateway.
I'm fast coming to the conclusion that IPv6 just isn't ready for prime-time yet. Support in some of the key components is unstable, and feels rushed.
PPPD, the daemon used to facilitate an ADSL connection for example, doesn't set a default IPv6 route when the "defaultroute" option is specified. Of course, it works for IPv4. To get a default route when the connection is brought up, you need to employ scripting that should really be unnecessary.