I'm trying to decide if I should include Compass when starting a new Rails 3.1 project. I haven't used Compass before.
Rails 3.1 now supports SCSS directly. The Rails 3.1 asset pipeline (via sprockets) now compiles stylesheets automatically. And I can use a SCSS version of a CSS framework such as Blueprint directly.
What benefits will I get from using Compass with Rails 3.1?
Compass is a design-agnostic framework - e.g. you don't have to worry about which browsers the users have.
e.g. Compass has add-ons, like for example the CSS3 cross-browser features: http://compass-style.org/reference/compass/css3/ this way you can specify things in your .scss files browser-independent
Side-Note:
The way Rails 3.1 processes .scss files, is one at a time -- e.g. if you define variables in one file, they don't get carried over to the other .scss files. IMHO not really optimal solution.