a mate has one and they seem ok . I dont like the way the inlet tube goes to the bottom, we chopped it off a bit so there is a gap to the bottom if oil pools in there. The theory being if oil is in the bottom any blowby will bubble that up like crazy, and so long as you are below that lowest baffle it is doing it's job. Also put some coarse steel wool in top layer, but to be honest car doesnt put anything into the can anyway so cant comment if any of that was worthwhile.