some slight positive gains on 1 site, but nothing on another, but it's still early doors. i had a nice boost with the last update but then it slowly dropped back after a few weeks
well that depends the quality of that traffic. you could send thousands of registrations to someone but make next to nothing if your traffic is garbage.
I'd say someone who dominates the SERPS but also has a specific product that people go to, and want to use no matter what position they are in. think something like oddschecker