Hounds are okay? They can only outflank, not deep strike, which hurts them, but putting a lot of bs 2+ ap-2 d2 shots into a psyker is decent, if you can get close. Theyre only s4 though which isnt great. Plus the benefits of an 18" -1 to cast aura is pretty good, though I think overall a culexus does the job better, and can deep strike.
There is no way these are going to be troops, obsec units that can turn off other units obsec is insane, theyll be elites like their generic cousins.
The thing is, these are more of a meta pick, and probably a fairly weak one too, Id love them to be the hot new unit but I think they fall down for all the same reasons reavers do. What we really need is a Hounds of Morkai lieutenant with all the same rules.