I’ve used it for a few years and I like it, I pay once per year and it’s the same T-Mobile service. There’s no roaming though so I always get a local esim when I travel abroad. Kind of iffed T-Mobile just bought them though. They say oh we’re actually keeping prices the same and giving you more data (as mint has traditionally done every other year) but I have a feeling this will be the last data increase we’ll ever see. And also some people complain about deprioritization but as a former T-Mobile customer I can tell you it’s the same places like busy malls or stadiums where direct T-Mobile customers aren’t having a good time either.
My moment with T-Mobile was when I got a Pixel and needed the new smaller SIM size and they wanted to charge me. I was like okay well if you won’t give me the SIM then I can’t pay you for service, and that was that.