I had a chance to try Sprint LTE while I was in Kansas. I was averaging 4 Mbps down and less than 1 Mbps up. I was not impressed.
Must have had poor signal then...and you can't trust bars because they measure 1x voice signal rather than LTE. Unless you have an iPhone anyway.
I was using an iPhone 5. Why does that matter?
The iPhone 5 displays the signal strength of the data network that it is connected to. So it would be displaying the signal strength of the LTE connection when you did that speed test.Which brings me to another point: LTE requires a decent signal for good data rates. Poor signal? Don't expect good data rates. Just like LTE on anyone else's network.