I do have IPv6 connectivity through another provider, AAISP and their L2TP tunnel service which is native IPv6, so slightly better than 6in4 although still a tunnel, the downside it's an additional cost but a better solution longer term. I used 6in4 for a while but it's generally an issue on Virgin Media connections which I also have, so I ended up moving away from it. Technically because I have multiple static IPv4's with various providers I could have the tunnel linked to a non Virgin Media IP and that problem goes away, but it's an extra dependency, that if the WAN it's going through drops or the tunnels goes down, so does IPv6 with it.
The main reason for IPv6 across all WANs I have is multihoming so you have failover for each WAN without such dependencies. Obviously at the moment, I only have IPv6 from a single provider in this case. Although the AAISP tunnel isn't bound to a specific WAN technically, so it could easily failover to Vodafone, just at a reduced speed due to Virgin Media being 100 Mbps, while Vodafone max is around 70 - 80 Mbps.
6in4 has been useful though over the years. It allowed me to learn a lot about IPv6 generally, even though providers have been slow with it.
Edited by jamesmacwhite (Sat 19-Sep-20 13:34:24)