Be sure to check out the announcement about the Early Access Incentive Program, read about it in the Green Circle
We have been participating in the EA program since we purchase the appliance in 2011. It's has been mutually beneficial for us since we get to try versions out and provide feedback on upcoming releases. We have also had some of our recommended changes incorporated into the product. You also get access to the developers and founders and learn about where the product is headed and some of there industry insights.