Are We Sure About LTE for Unlocked iPhones on T-Mobile?

I think I am going to have to check this out and see just how good this works. T-mobile themselves say you will only get around 3G service with ANY unlocked phone. 

Take a look:

http://www.theverge.com/2013/4/5/4188044/t-mobile-iphone5-update-enable-lte