I just got a Moto X and popped in a Skinny SIM and on mobile data the 4G indicator lights up and seems pretty quick.
I did a speed test at 17:33 today (probably not the ideal time for a speed test!) and the mobile data was almost twice the speed of my Christchurch Vodafone cable speed, clocking in at 21.31Mbps.
Is this likely connecting at 4G, or is the "4G" indicator just a generic one for mobile data?
I was suprised as I didn't expect the Moto X's US 4G frequencies to work, let alone on Skinny!
