I've had T-Mobile 5G internet for several years now, and no issues. I'd say I've had to reboot the router more than with Comcast. But our area has also gone through a lot of tower upgrades. I'm not a competitive FPS player, mainly playing MMOs and nothing unusual. Streaming content has been fine. I also work full time remote with an IT job, and that hasn't been an issue either.

It's going to depend on how good your local signal is. T-Mobile phones in my area work well, while they don't work as well when I visit my parents in another state. So the 5G Internet will follow suit. If you don't have T-Mobile phones then you'll have to pay attention to friends or reviews in your local area.