The main reason you should use it is that
there is no better alternative.
We are aimed not simply to build a product you envision, but turn your idea into a working, successful and profitable solution. Taking advantage exclusively of our HTML5/CSS3 development team is just a tip of the iceberg since it provides only the way to turn the designed UI into code.
If you need more than that, say, to build an HTML5 product from scratch, we can:
make a research to define feasible business goals, market capabilities and competitors’ advantages
design user experience that will be based on customer feedback and real-life scenarios of using your product
create stunning and modern user interface that will visually attract your potential clients and satisfy your users
implement that design through HTML5/CSS3, making it responsive, cross-platform, interactive and light-weight
if needed, develop the back end of your product using the best frameworks and tools to make it work flawlessly
maintain and improve your app even after its release to keep it secure, reliable and up-to-date.
And all that can be done under your guidance if you prefer!