If you are an engineer like me you are obsessed with features. But people do not buy a product because of features. they buy it because of emotional benefits.
Therefore: If you want to sell something - sell it emotionally. Forget features.
[1] http://thestartupfoundry.com/2011/06/16/your-startup-needs-to-sell-experiences-not-features/
[2] http://swombat.com/2011/6/20/emotional-benefits