Currently it is slightly more useful than running a beast up as a road bump. However it's still pretty easy to kill off. Seems a lot of points for a mild order of activation problem for a single turn
So my impression, and this is with absolutely no playtesting or reading of playtesting reports, is that running it up as a speed bump is NOT how it will be successfully used. I think all the time stutter/animus stuff are gimmicks that will come up once in a blue moon.
Rather, I'm excited that it is a fast heavy with flight and a spray with paralysis. This, to me, makes it a mix of a Rattler and a Glimmer Imp, and that is interesting. It can deal with swarms of infantry like the Rattler, with less damage potential (one spray will NEVER wipe out a 10 man unit+), but far easier to apply. Also like a Rattler, it can put damage on a heavy, but will likely need help to do more than scratches. It can debuff DEF, not as easily as the Glimmer Imp (has to hit, vs "I see you!") but with a much greater drop in DEF.
Now, I don't know for sure if it'll replace either one, or both, in any lists. I think a Child DM list will take 1-2. I think the Dreamer will stay away from this like the plague. The other casters, idk.