Here's the elevation profile from doing it clockwise a few days ago...ignore the distance because it always overstates it. but you can see where the steep climbs/declines are, depending on which direction you hike it:
The Coosa has about 275 feet of ascent per mile, on average.
By comparison, the Arkaquah trail from Track Rock Gap to Brasstown Bald parking lot has about 500 feet of ascent per mile...of course it is just 5.5 miles vs 13.
And Unicoi Gap to Tray Mtn and back has about 300 feet ascent per mile...and about 10.8 miles for that one.
So you can see by those numbers that the Coosa is a bit overrated and not much more challenging than some other GA trails. Of course many in NC are much more strenuous. Well it's still a fun hike if you are in the right mood and I dare you not to be at least a little worn out by the end.