Based on comments. I'm going to try Nova on my Tab S2 for a while and see if it's worth the $5.
my favorite feature is swipe gestures. I have my phone set to: swipe up anywhere on home page to bring up app search (so I can quickly search and launch an app) and swipe down anywhere on home page to bring down the notification shade. The latter gesture will be handy for how tall these phones are.
Just after a few minutes, I think I'm going to plunk down the 5 duckies. The one thing I noticed is if I click and hold on an icon, a context menu comes up. That is very simular to the Force Touch on my (soon to be traded in), iPhone 6s Plus.
I may not use it on my Tab S2 though. Mostly because it is the Nook version and when I swipe from the left, it takes me to the page I was on in the book I am reading. Nova is really smooth though, it seems smoother than TouchWiz.