@extend itself is awesome and you should use it extensively, especially when using a framework. For instance, if you're using Bootstrap, when version 3 rolls ar

@extend itself is awesome and you should use it extensively, especially when using a framework. For instance, if you're using Bootstrap, when version 3 rolls around and removes a ton of old class names, you won't have to hunt through all your view code to replace classes. You can look through your SASS files and just update @extend's where appropriate. I highly recommend looking at Object Oriented CSS and Ian Storm Taylor's great post on combining it with SASS: http://ianstormtaylor.com/oocss-plus-sass-is-the-best-way-to-css/ http://ianstormtaylor.com/oocss-plus-sass-is-the-best-way-to... Using SASS placeholders and @extend'ing your framework's classes are a great way to reduce code duplication and complexity. I recently redid our entire frontend using these techniques and it reduced our SASS code by about 30-40%, got rid of plenty of gnarly nested classes, and made it drastically easier to start adding new features.