Anyone use a DF-17 adjustable PCV?

In my never-ending quest for improved idle and just-off-idle manners (big cam 451, 8" vacuum), I'm considering investing in an M/E Wagner DF-17 tunable PCV valve.

http://mewagner.com/?p=444

But that little billet piece is $129.99... before I spend that much, I'd like to hear from anyone who's actually used one, and did it help?
thanks.