Have had my Elite "basic" catch can on my brand new 2016 5.3 now for about 300 miles. Installed the unit at just over 400 miles on the clock; and now have just over 700 miles on her. Collected about 1oz. of what looked like straight oil...............but was more than a few shades darker than what the oil on the dipstick looks like. Leads me to believe that it's doing what it's supposed to!!
Also; it's been stupid HOT/HUMID here in the northern part of "The Peoples Republik of Illinoiz" since I've owned this truck.