I love this feature on my Samsung TV, however it can be inconvenient when I'm using it but can't use my phone at the same time. I hope they can modify that soon.
i had issues with that. SmartView app stopped working. whole TV was freezed and I had to turn it off and on so It would unfreeze. I thought it was TV's bug, so i didn't report about it. (btw phone was Allright )