I have been, but there is two steps you need to perform before it will work with IDEA:
2.) From the project root directory, issue the "sbt gen-idea" command. This will generate the IDEA project files. Any time you update the Build.scala file, you'll want to re-run this.
ALTERNATIVELY
You can install the Scala and SBT nightly plugins for IDEA (I'd do this anyway), and Import Project, select the SBT project type, check Auto-Update, and it will do the same thing as the sbt-idea plugin, but automatically update when Build.scala changes.