Hoping HP won't mind that we've drifted off topic....
I'm also a fan of billion, in my case 7800.
I only had it for a few weeks on my 56dB ADSL line and, to be honest, noticed no significant improvement in line stats over the netgear it replaced. But aside from all that, I just like the thing. The 7800 (at least) is in a nice big clunky case with lots of ventilation, never gets remotely warm. Wall-mountable too, if that matters.
ISTR that WiFi did seem to work better - longer range and better throughout, than any previous router. I've disabled 5GHz because it doesn't suit me, but did work when tested.
Some quite elaborate networking can be set up including guest networks with varying degrees of isolation, thereby allowing visitors access to Internet, but not my home network. It's not that I don't trust my visitors, more that I've no way of knowing what sort of malware might be on their devices, so I don't want them on my LAN. Other modern routers also have guest networks, but I find it hard to believe they could do it any better than billion.
It has also proven 100% reliable - not once, in the 18 months or so I've owned it, has it required an unscheduled reboot.
And of course, having the Wan port, when FTTC came my way I was able to seamlessly keep it in service with all my fancy guest networking configuration.