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I really like this design it's eye catching and pleasant to look at. I would make the headings bigger/bolder. They are the same size as some normal text ie. testimonials.
The spacing between the video box, the tabs and the product tour is good, but at the bottom it's too cluttered. Keep the spacing consistent and it will be much easier to navigate.
The tabs next to the video box also look a bit odd.
Great job otherwise :)
