When we released Foundation in 2011, we wanted to create a way for people to easily build responsive sites, and that continues to be our driving motivation. At ZURB, we almost exclusively create responsive sites for ourselves, and our clients, and Foundation plays a huge role in that. We use it every day, and we know it works.
We decided that Foundation would be built on Sass (Scss, technically) a little over a year ago and we’ve never looked back. Not only is Sass in constant development, but through Sass you get the power of semantic code, faster styling, and tons of awesome programmatic features.