I can see the appeal of that, but I don't prefer it on my own device. I tried using the PA Halo feature for a while (on Carbon Rom), but it felt like a gimmicky replacement for my already-existing notification panel. I like the notification panel. It shows you new notifications, it's there when you want it, and when you don't, it's not taking up any screen real estate at all. Halo is always there (at least a little bit), it shows me the same thing as the notification panel does (while being more difficult to clear notifications from/view their originating app), and it really adds no extra functionality other than allowing you to float one app over another (although it takes up most of the screen and there's not much advantage over simply switching to that app).