Just removed the CDV. Took about 6 mins. (not including the 10 mins to get the wife out to bleed the clutch). Does feel a lot better. Guess Ill need to drive it around for a bit to see the difference.
It looks like it just restricts the flow by having a very small hole in it. So my guess is the Zeckhausen racing ones just make the hole bigger. Save your $ I say.