yes i have. i did like 5 or 6 normal raids to get my whole Ignis set (Knight set 72-73).
Priest miku doesnt drop armor boxes. so theres only 4 pieces of set, no helm
stages 3 (Kunta) and 4 (Miku and Yuzak) are the hardest. So i recomend not to go with a main toon. I made 2 rogues specialy to run raids (normal and hard) , so i dont have to worry about losing sp.
I dont know about farming sp or training pets in there, i just went for the set
hope this helps