Are people responsive to your stories? Have you had problems with people stealing your stories? Is is interactive like this site? for example can you make layouts or book covers?
I've heard of it but I don't want to waste valuable writing time unless it's going to be useful.
Also any other active story sites you know about besides Mibba, Wattpad, ff.net. Quizilla and fictionpress are ghost towns these days.
Check out Ashen Skies