Buildr vs Gradle, pros and cons?

I looked at both gradle and buildr and went for buildr in the end because of one huge disadvantage with gradle: start-up time of the build system. buildr is much snappier and gave me much faster incremental builds. Performance is something I found almost unbearable with gradle. Just consider how many times a build system is kicked off and add up the constant overhead.

BTW I found the build server with both build systems (buildr and gradle) to be not very useful and error prone (that is: I spent more time with troubleshooting than it actually sped up things).