FYI for those who are interested...
I just called Motorola Canada and they tell my SIM unlocking voids warranty? WTF?
Anyhow it would seem that the Rogers Moto X has 2100 and 2600 LTE bands, but Telus uses 1700. This means it would only be HSPA+, which is still fast, but not LTE.
The T-Mobile Web site shows the Moto X with LTE bands as follows "4G LTE (Bands 2, 4, 17)"
Looks like the TMo version is like all other TMo phones, the same specs as Telus network requires (ie Samsung Galaxy S2 = same phone for both).