I have been with ABB for a little while, and when I signed up they either sell you the NF18ACV or you could supply your own modem. Maybe now they supply one for free?
Anyway I did some research over the net, and the NF18ACV seem to be a reasonably priced and reliable piece of gear. One could get better by paying more, but for me it represents the lowest risk as ABB is familiar with it. I didn't want a powerful but exotic modem that presents an unfamiliar challenge to the ABB tech support if I run into problems.
I actually looked out for sale and purchased my own box of NF18ACV to save some money. The ABB modem does come pre-set and plug-and-play. Not a problem as I found configuration and setting advices online. ABB also provided useful set up information, and any problems (like VoIP) were resolved after engaging with their support team.
In my home I set up the NF18ACV in bridge mode, i.e. I do not use its router functions. The modem side of NF18ACV is as advertised, quite stable connection, although the initial hand-shake took some time to establish each time I restart it. Over the last twelve months we did experience semi regular problems with slow NBN/internet, and restarting the modem didn't resolve the issue in all cases; so the suspicion is with ABB. When working well the download speed is good. However the bufferbloat is average; again, I don't know if that is the modem or the ISP issue.