@LMnet Sure, ScalaCSS is production ready. From a prod standpoint, all it does is generate CSS. :D
If you compare it to other css preprocessors, the only real advantages are 1) It's in Scala which is cool if you like Scala and/or want to write your own preprocessing functions. 2) Automatic browser prefixes for css keys/values.
If you're using inline-stylehsheets the advantages are many, many, many. The feature list (and project requirements) in the ScalaCSS online doc tells the beginning of the story and it will only get better.