IPv6 trial on Billion BiPAC 7800N

[#1]

I thought I'd post a note on configuring the Billion BiPAC 7800N (firmware 1.06h) for the Plusnet IPv6 trial. My setup is stable and responsive, and I've not had any MTU problems. The bandwidth is rather less than IPv4, as measured by http://ipv6-test.com/ but I assume that's due to less Plusnet infrastructure being allocated to V6 that V4.
Anyway, here's the WAN profile page, the LAN IPv6 Autoconfig page and the advanced status page. Essentially the only manual thing to do is copy the LAN IPv6 Address (including the /56 at the end) to the Interface Address/Prefix Length section of the LAN IPv6 Autoconfig page.
I've left DHCPv6 Server disabled, but enabled router advertisements - my Ubuntu systems, Debian systems, Android phones & tablets and Win 7 laptop all seem to prefer this. I score 10/10 on http://test-ipv6.com/ with this configuration and haven’t experienced any V6 issues at all. The only problem is lack of inbound V4 connectivity, but I'm not too worried about that, I assume that's not related to V6 in any way.

[#2]

Very helpful review ! 
Have you tried using the hidden SNR tweak menu, to see whether you can get a better sync rate ?

[#3]

Yes, I've tweaked it a little - not too much - I recently got 101 uninterrupted days of connection at over 15mbps download, quite impressive!