This trail really needs to be reviewed in sections, preferably from Scott Lynch's book. Some parts are definitely moderate with long stretches of trail that is smooth, easy, and crazy beautiful. Other parts are steep switchbacks with big trees to crabwalk under or scrabble over.
A friend and I did 35 miles, starting at Oconee and ending just before Whitewater Falls. Outrageously beautiful - all the streams and creeks were running, and the Chattooga was raging. Waterfalls everywhere! Mushrooms of all colors, waterfalls of ferns, every moss and lichen, blooming rhododendrons, We were glad we had planned low miles so we could stop to explore and take pictures.
My caution would be that it was hot with very high humidity, and we almost couldn't drink enough water to stay hydrated.
We will be back to do more.