I am working full time on a pretty cool project, called VersionEye. We just launched a couple weeks ago and we are still playing around with the landing page. I want to share this very interesting fact, we found out about the user behavior.
When we launched a couple weeks ago, the landing page looked completely different. There was a short 50 second intro video on the top of the landing page. The Video is still on YouTube, if you want to take a look: VersionEye Intro Video
5 Guys worked nearly 1 month on this Video. We put a lot of work and time into it. After 3 weeks I realized that nearly nobody is watching the video. The people just scrolled down the page and nearly nobody clicked the play button.
1 Week ago I removed the video from the landing page. And in the last days the numbers of page views tripled. We have now 3 times more page views and the users are staying in average 3 times longer (10 min) on the page then before.
Is that not interesting? I am very surprised. I didn’t expected that.
Sorry for my not perfect English. I am from Germany.
Robert Reiz 
I can confirm this by experiences in other projects. There we had as well intro videos an even to shorten the video from five seconds down to three brought five per cent more conversions to the following pages. Good luck with VersionEye.