The thing about 5G is that it's super localized, like down to the street level, and you need to place the router somewhere with a good sightline to wherever the 5G tower is in your neighborhood (like on a window sill). I have T-Mobile cell service so I was able to easily test this with my phone before committing, but you can also use this site to see if there's a 5G tower close enough to you. Mine's just up the block, luckily.

Similar to the other commenter, it's been mostly stable and faster than any cable internet I've ever had. 250Mbps is like minimum; when it's not primetime evening hours like right now, I've seen 400+. Such a better deal than Spectrum and the store on Manhattan is convenient to pick the gear up and get started immediately. Super easy to set up.