Although I have not played it, I've been told that Essex is one of his, if not his, best.
One that I have played, that is very good is Augusta CC and Inverness is over-looked (it is borderline great, if you can over-look a few renovated holes).
In total, I've played 11 Ross courses (Pinehurst #2, Inverness, Seminole, Pine Needles, Holston Hills, Augusta CC, Mid-Pines, Gulph Mills, Columbus CC, Southern Pines, not sure if Old Elm counts)...and each one has been, at a minimum, very good.
I believe he is an excellent router of a golf course and his greens are outstanding.