...and it's buggy. I keep getting disconnected from the server (unclear if this is a kick or a bug) and the entire game screen just turned white, threw a Java error, and I had to force a shutdown of the game.
Same problem - trying to connect using 1.0.3 | 1.4.6 and it fails. Needed mods are:
MekanismGenerators 5.0.0
AssemblyLine 0.2.0
MekanismTools 5.0.0
However, the message on the server entry says to use the Dev Build option in Tekkit loader, and that seems to work.