I find it more rewarding when I am bound to a certain character limit. I write what I need to write, as oppose to worrying about being eloquent. Maybe it's just me, but I enjoy short essays because it gives the admin a quick snapshot of who you are and if they are interested, you can talk up on what you wrote when you interview as oppose to, "Yups, that all I got to say admin. It's in the apps." My 2C.