Very cool but it can't replace an articulated screen totally. Each has its own pros and cons.
The articulated screen is still needed when u need to hold ur camera at wierd angles and control the settings. Unless the camera is mounted somewhere, u can't hold ur cam and still fiddle the settings from ur phone at the same time with only 2 hands.
The remote will b especially useful when the camera is mounted a distance away and u like to remotely control it. It'll be useful too if u find ur camera LCD too small and like to view on e larger screen of ur phone.
Should still be ok & useable when right hand holding up the cam high while left hand holding the phone for LV.