I have a Billion 6300NXL. I've never known it crash and it stays connected 24/7 (I host my own mail server so can't afford down time). It also supports dual-stack IPv6/4 as I proved with my previous ISP. The only downsides are:
* It doesn't have a 'disconnect' option on the UI so restarting is the only way to bounce your PPP session that takes longer and disrupts the LAN.
* By default it runs an open DNS server(*) on the public WAN. To disable it you have to forward port 53 to an unused IP address.
I'm not sure how good the wifi is as I use a separate WAP. The 6300 also supports dual EWAN so you could stick a 3G USB stick into it and use that as a backup in case your main connection fails.
(*)It seems most Billions do. You can disable this on some of them as outlined here ( https://support.aa.net.uk/Stopping_Open_DNS_-_Billion
) but changing the filtering didn't work for me.
Edited by Andrue (Fri 22-Jan-16 20:16:35)