We've been developing our new site using the Pinstagram theme for about 4 weeks now, and we finally went live at weekend. Take a look: http://www.onedirection.net/
Our site is the worlds most popular One Direction fansite, and for the past year we've had two separate themes for mobile & desktop, using a mobile switching plugin. Not ideal, and was pretty hard to maintain. We searched for a fast, attractive responsive theme until we found MyThemeShop, and decided to go for the Pinstagram theme.
Definitely made the right choice, and our site is loading super fast right now.