5 stars: For those who haven't read what this app is supposed to do, it works great. Some users seem to think it should allow you to play PS4 games on your mobile screen. No. What it does do is allow games which support a second screen to display things like maps, help and instructions on your phone while playing. It also lets you navigate the menus and type into text boxes using your touch screen rather than a joypad. Very useful.
5 stars: It's useful for a quick remote to control my systems main menu. Couldn't turn my system on, but that's just because I forgot that I set it to fully power off from rest mode after a set amount of time. Going to get the Remote Play app for my laptop soon so I can try to play games without the main TV.
4 stars: Great app, functions as advertised. I've really enjoyed being able to use it to remote play from a different room. No lag issues or anything like that for (granted I have a very good internet connection). Only reason I'm not giving it 5 stars is that it only works with a PlayStation controller or touch controls. I have a Razer Kishi and I can't remote play with it in this app.
4 stars: This app worked perfectly fine for me, all the features worked as described. It isn't laggy either. But my only problem is that it is complicated in some parts like when you want to use the text to speech in party chat and it would be great if you could make this feature available without being on your PlayStation itself.
3 stars: second ...