I never actually attempted it, but I think about it daily. The thought of getting older knowing I will die boggles my mind. The only thing that stops me from ending it sooner is the fact my existence matters to at least four people.
I remember something from a philosophy course in college about a guy who trots to the front of his house to sit thinking about how hard he worked to make money, raise his kids, and keep his wife happy. He is close to death at the time as he thought, "was it worth living only to die in the end?"