Switched entire family over from AT&T about 10 days ago thinking we would get better 4gLTE (GoUnlimited) coverage and speeds but it is arguably worse than AT&T in Pearland, Tx (77584). I haven't been able to get any DL speeds over a 200KBs within a couple of miles around my house (2526 Lansing Circle Pearland, Tx 77584). I recorded several results using Speedcheck Pro but lost them trying to sync them to their site. I will run them again but here is one I did recently...
https://www.speedcheck.org/result/212885857