Note 4 - TMobile 700Mhz LTE Band 12 Question

I live in the Twin Cities and according to the 700Mhz map, T-Mobile has deployed Band 12 in my area. Is band 12 supposed to be faster and better? Or is band 12 just to help penetrate buildings and cover rural areas?

I'm debating if a phone upgrade is in order based on Band 12 feature.


Thanks!