We (my wife and I) had our FPs done in Charlotte yesterday. Not a bad experience at all -- office was fairly empty and staff were pleasant -- we were done within 45 minutes.
This contrasts quite markedly with other experiences I've had in the past. FPs for GC were taken in Indianapolis -- the room was crowded and the bloke who took my FPs was not at all pleasant. Worst was the San Diego DO, where we had to get our passports stamped after GC approval. The queue snaked around a couple of blocks, and we had to shuffle along for 3 hours before we even got in the door! On top of that, the staff were positively surly.
Drove past the new Durham DO a few days ago and it's coming along nicely! The address (201 Roycroft Drive) is too new for Google Maps, but it's behind Rudino's Pizza in the RTP. To get there, take Exit 281 south off the I40, and then take the first left into Central Park Drive.
Now to see how much shorter the IL will take than the 730 days quoted!