It's no accident that every time this topic comes up that there's no one that can say definitively that they have even close to a 50% double rate. It's always either "no I'm in the 30s or low 40s" or "well maybe over a larger sample size it evens out". It does not. I've had this perk since the day it came out and every day when I run my 5-10 surveys I typically hit 35-40% doubled nodes.