I saw the new advantage rule in play today.
Scorpions knock on about 10 metres out. Wigan kids gather and rather than run just hoof a big angled kick to the winger.
Scorpions managed to get back and regather but the ref calls it back and it's a Wigan head and feed at the scrum where the original knock on took place. I think many a dozing winger/full back will be caught out by this as if the attacking winger (Wigan in this case) wins the race to the ball then it is a try most of the time but it is risk free as if the defence gathers they get possession back in the form of put in at the scrum anyway.
I'm not in a place to say whether it is a change for the better but it got people thinking that's for sure.