The only difference should be in the radio specs...
X150Q =
2G @ 850, 900, 1800, 1900
3G @ 850, 1700, 1900, 2100
LTE @ Bands:4, 7, 17 (FDD 1700/2100, 2600, 700)
X150E =
2G @ 850/900/1800/1900
3G @ 900/2100
LTE @ Bands 5, 7, 9 & 38, 40 (FDD 800, 2600, 1800 & TDD 2600, 2300)
If your HD LTE is operating well on your network, you have the correct model.