Initially I thought EGR fumes would be worse than pcv fumes, but then I took apart a d15b8. The intake manifold was filthy oily black. (d15b8's don't have EGR valves). In defense of the egr argument the engine was burning oil in the #2 cylinder due to what I guess to be leaky valve seal.
I honestly just wanted to do this to see what kind of blowby I was getting and keep the oil from burning through my engine.
I only ran it for 27 miles. I replaced my pvc valve the weekend before so maybe I need to make sure I didn't accidentally unplug it when I installed this guy.