Speaking with Chrissy, Sterling's wedding coordinator, was a pleasure! She was extremely nice, responsive, and went above and beyond in confirming details with us -- she was even thoughtful enough to ask for a primary contact person for the day... of the wedding, since she didn't want to bother us. So nice!
We did the "no guest left behind" shuttle package for transporting guests from the hotel to the venue and back. The shuttle was very nice, and the driver was friendly, but there were two cases of miscommunication -- on the final trip from the hotel to the venue, we had scheduled the shuttle to leave at 2:50, but found out that he instead left at 2:30, leaving several of our guests stranded at the hotel, and forcing them to take Ubers. Second, at the end of the night, the shuttle driver apparently told guests that 9:20 was going to be the final shuttle from the venue back to the hotel -- we had to run and tell him that because we had booked the shuttle through 10:30, there would definitely be enough time for him to drive the 20 minutes back and forth and still do another shuttle run. This ended up working out, but it was a headache and caused confusion among our guests.
We can definitely recommend Sterling, especially the great process of booking everything, but be sure that the driver fully understands the times of departure and arrival.