It completely replaced IBOConsole for me.
IBOConsole has no 64 bit support and can only run in Windows.
FlameRobin on the other hand has 64 bit support and runs in many OSes.
I've been following the progress of this project since 2005 (version 0.2.0).
Back then it looked very nice and very promising but it wasn't "there" yet.
Now, it IS "there". Maybe the developers should change the version to 1.0 to celebrate it