I watched it earlier this year, got to part 4, forgot about it, remembered it, watched it all again so I knew the whole story, then watched he last part and almost cried at its magnificence. Oh, and I re-discovered ponies along the way.
It was legitimately the best fanwork I have ever seen, and a crossover at that (usually not a fan, though MLP does seem to have good crossover potential.)
It also gets the reward for Best Use of Moonlight Sonata. I love that piece.