@alexhaydock yeah not a lot of people know about it. it's really nice.
i mentioned it because you specifically cited the issue of losing your IPs. whether you use my setup with standalone l2tp, or one of their hardlines with backup l2tp, you would retain the same IPs.
when my main internet goes down, and switches to the backup, it stays online and my IP addresses do not change.
quite often even my irc client doesn't drop during the switchover. it's quite nice.