Another way to do it that I have seen is to set the unit's model to a dummy unit's attack and spawn the dummy where your unit is and then hide your unit and make the dummy attack the target. then just move and unhide your unit, however when the missile hit's the target it will shot the models death animation.
Ghan has said he has fixed this. Monovertex please confirm this fix. This was only a problem with people that had signatures in the upper levels like not the special members but the respected members.