Everywhere I get LTE signal, I only get it for that day and it seems to get turned on every once in awhile. I am guessing they are turning on these sites as they are working on them to test the new implementation, then turning them off when they are done to stand by for the big launch date! Just my guess.
This is between Martinsville and Bloomington on the 37. The 1.48 is when I reached about 10 minutes out from Martinsville. Bloomington shows a consistent 1.4Mbps-2Mbps otherwise:
I saw that I had a iPhone set as my phone as well. I changed it to GS3 probably as you were typing that response. Do you know how you "notice" eHRPD on the phone? Does this manually need to be done via ##DEBUG#?