PCV Oil Seperator

I know this has been talked about in other threads, but I am looking to see if anyone has had any luck with the different gadgets that are supposed to filter the PCV system. I have done the complete TSB and still get some oil blow-by. I have been thinking about installing one of these products but am worried it may interupt the proper amount of air flow through the PCV system. Has anyone tried this with any positive results?

Pics from a mustang.

http://www.miracerros.com/mustang/pcv_filter.htm

Back when cartrackers was active some of the users had installed filters like these without success.