Depends on your definition of "actually good". I've been a T-Mobile customer since they first entered the US, and I've generally been happy, but I was incredibly upset when I saw that they started zero-rating "approved" music services[0] .

I have unlimited data, but as a strong supporter of net neutrality, I take issue with that.

[0]https://www.eff.org/deeplinks/2014/07/net-neutrality-and-glo...