The OP was about catch cans on port injected engines. I think they are a waste of money and effor unless the application is a track or race car.
Oil ingestion and catch cans on DGI engines is a different issue. All manufacturings with DGI engines are having to deal with what to do about intake valves which get oiled through the normal function of the PCV system and then the oil cokes.
My understanding is that right now, if it's forced to address an DGI engine with coked-up intake valves, GM replaces the heads.
What problem are you trying to fix with it?
The PCV valve serves two purposes in the stock setup. When in vacuum (as in the above diagrams), the PCV valves job is to limit the flow into the intake manifold (think of it as a coffee straw). If it were not there, the intake manifold would essentially have a huge vacuum leak, and idle would be erradic. On top of that, the amount of vacuum seen by the crank case would likely be way too high... hurting oil control and potentially causing damage to the motor.
In boost, the PCV's job is to prevent boost pressure from entering the crank case. It behaves much like a check valve in this function, not allowing flow in the opposite direction. Herein lies one of the primary deficiencies of the stock system (especially at higher power levels): when in boost, not only does the crank case no longer have a source of vacuum to help purge the pressure... but it's also limited to a single port to vent out of. And unfortunately... that port is all the way on the opposite side of the motor from where the pressure is generated. As the pressure flow travels from the crank case, up through the timing cover, and out through the gamut of valve cover baffles... it picks up lots of oily vapors. The valve cover baffle network does a decent job at relatively low power levels, but as the blow by increases, they can become restrictive, and don't do as good a job in containing the oil. This means residual oil vapor ends up going into the turbo inlet pipe, and eventually into the motor. These oil vapors aren't just "nasty" cause they're dirty looking, but oil vapors can also significantly reduce the effective octane of the fuel, increasing the potential for detonation. Here's a diagram of the stock pcv flow under boost:
PCV Plate & Vented OCC Notes
I'm old enough to remember as a kid crossing a street and having to walk over tar strips in the middle of the road from engines venting down below the transmission bell housing and onto the streets. Ouch! Long time ago....