Interestingly, the Optimizely landing page looks completely different now, with a lot of the content that used to be there placed elsewhere on their website. Assuming that they used their own technology to improve their own landing page, we could perhaps conclude that their old information-heavy landing page wasn't good for conversion, and their newer page performs much better. I wonder why; the old landing page looks a lot better to me, and seems to make a lot more sense if you look at the theory behind it (as put forwards by the teardown).