The only change is that you can leave your phone in airplane mode instead of having to power it down.
I don't know anybody that actually listened to the flight attendants. Most people just put their phones in airplane mode anyway.
So basically nothing actually changes. It would be nice to be able to listen to my music without having to hide my headphones so I don't get yelled at.
At least on Virgin they don't bother you because they just assume you're using their entertainment system (which I'd imagine generates more interference then whatever your little device does). I guess on their system you have to watch advertising though - makes it worth it to them.