To follow up on the 183 & McNeil area, I checked it out while parked outside of Krispy Kreme tonight. Attached are my screens during testing. Very nice...now follow me around town.
I have also experienced it in the following areas over the last week or so:
Round Rock NW of IH-35 & SH-45 (outside and inside of Sam's Club)
Howard Lane & IH-35 (Techridge area)
McAllen Pass in between Howard Lane & Wells Branch Pkwy
and later at my house nearby but then the LTE was switched off (possibly testing tower temporarily)