[barbegal]

Do people have issues with these modems in real use cases?

The code that makes these devices fail uses up lots of UDP ports which suggests that the issue may be with the NAT implementation. I have done some searching online but haven't got a definitive answer on what exactly the issue is (other than it causes latency and hitter under certain conditions).

I'm slightly sceptical these modems (really modem routers) are as bad as this site previously suggested. It seems like the only use case that breaks them is some specific games where there is a huge amount of latency critical UDP traffic.