I don't particularly like their video intro. I feel like they've tried to fit it under a specific time limit (which is great) by doing everything faster, speaking faster and weirdly skipping animation. For instance, they take 20secs to talk about drag and drop and pressing prev/next to show the next mockup. He said "You can click the previous arrow or the next arrow to go to the next mockup". It's not relevent in an intro video. I.e. if the interface is well made, I'll figure out how to go to the next mockup when in that page.
Better would be to stop saying every little actions and talk on the high level goal. For instance, don't say "I'm gonna select a color to put on the front-end of my project".
Also, seems like the website is really well designed but the balsamiq part is still with the old flash design. Is it from the same company? Did they chose to not change the old balsamiq because clients were already used to it? Or was that too complicated? Is there an html only version incoming?