So, I have 25 mb service, with unlimited download, so I can run a Tor relay. I've had trouble with 'Sync no Surf' for a long time. The other day the sync stopped entirely.
I had this modem.
So the second Bell guy comes, which means the first guy gets a 'rework' on his record. Poor fellow. This guy tried 3 of these modems and they couldn't even get a sync. By the main test, my line is perfect, with a capacity 3 times the current use.
Finally, he made further internal contacts and found that for my service I get the 'new' modem.
This one was actually made this century! The time wasted to this point was 3 times the cost of the modem, but if you just yell a lot, they'll charge you $200 for this. This modem works perfectly, and I've slammed it with my hardest downloading test, which always blew the old modem. I could probably go back to an IP phone, if I wanted to, but if you lose your Bell phone number, you are in worse support hell.
This still has a stinky router with almost no options. But if you plug in a fully configured router, it knows enough to get out of the way and act like bridge. I now use tp-link generic router with openwrt.
Update: Still solid. This is absolutely essential.