I was using Google Now launcher on my Nexus 5 but was frustrated I could not choose to hide the Persistent Search Bar (it's on every desktop screen!). I seldom use it and would rather swipe up from the bottom of the screen on the rare occasions I do.
Also I missed the infinite scrolling between screens and the message notification in the icons that was on my Galaxy S2 (both part of TouchWiz I presume) so I took the plunge after some months and installed Nova Prime. I have to say, it is a very fine launcher.
Using Nova right now. Was using Action Launcher, which I should really be using because I paid $5 for pro, not to mention the 10 themes I paid for, yeah I'm about to go back to Action Launcher.