Ok, so I drove down I-26 to a doctors appt I had today. From exit 102 (Lake Murray), down to exit 107A for I-20, through the Harbison area, I had strong 4G connection. Ran a quick speed test and was getting 10Mb down / 7ish up.
My doctors appt was actually exactly at 378 & I-26, and there was no LTE signal there. Not sure if they are finished testing there and moved on to Harbison or what, but there was no trace of it once I'd passed I-20. Same results on the trip home...but glad to see it really is going to happen! Do you think they'll expand it into Irmo, or were you saying that Harbison's going to be about it for the NW end of things?