aside from the cumulative bonus, some of them look darned good.
I ran with whatever was best until i got the Blood Echeon gear, ran that until i got the gear from the Battle-towers; ran that through Ego Draconis, then in Flames of Vengeance- got the Order of the Scorpion armor.

it's too hard resisting the temptation not to use the armor sets-- since they are static: you know what you'll get outta them. getting random loot from chests, hoping for the best [often gettin' crap]- is just too sporadic.