Nova Prime is quite mature. It has the "ok google" fix so you can even run that voice function under Nova.
You can put widgets on the dock in Nova and that is rare. I put circle battery there and it's a perfect match.
Nova becomes additive in its dependable, steady and customizable API.
I like it -- My Note 3 today looks exactly like my S4 looked last year, which looked exactly like my S2 looked.several years ago.
I having my phone set up a certain way -and Nova launcher configuration delivers for each model. . .