Quick first impression. Loose the ad from the front page asking about your age. I don't like to see ads for other vendors when I am visiting a site.
On initial entry to the site, you are presented with a fairly standard UI, nice colour scheme (personally I prefer simple dark colour schemes)
There is a horizontal menu bar with a list of site options, and a vertical menu area on the left which duplicates these options. The vertical menu area is an unecessary duplication, unless you are going to add different categories, I would replace this with alternative content. Once you click an option from the top menu, this vertical menu disappears, which is an inconsistent UI design.
On opening a product, a detailed information page is displayed. There is a cluster of social media options on the right of the product and a review section, these lend a cluttered look to the page. Either space them out more, or remove them. I suspect a single line break between the "reviews" and the social media options will resolve this.
The product information is displayed using a tabbed interface, which is very good, including a related products and reviews tab.
Clicking a product image displays a larger version. Some of these appear to be rather poor quality, if you want to impress your customers, take the time to take a good quality picture of the product. Nothing is more irritating that a stock poor quality image. Good pictures = very professional look.
I found the large "facebook" box on the left mildly irritating, considering everything else is coated with facebook everywhere, I would review your social media strategy carefully
This is only a quick look, on a desktop browser using Chrome.
I do not have my tablet to hand to see how it looks on a 10 inch screen.
