I've not noticed any real difference in oil consumption. I'm still working on using BG 109 (EPR now) and using Rotella T-6.
I don't have to buy and PCV valve every oil change so I'm saving money there...only take about 28 oil changes with no PCV valve to pay for the catch can.
I like the look and I'd do it again, but no real reason to do so from an improvement standpoint.