I have one of these types of catch cans in my car currently. As far as I can tell it works great.
What's up with the expensive catch cans? LoL.
I guess I'm more of a DIY guy.
I am going to try to think up another version of this inline type of catch can. On my last car I had an open PCV system with this homemade can:
Seafoam for the win! lol