I was pretty taken with the Google Experience Launcher
(now the Google Now Launcher
) with it's début on the Nexus 5. Up to that point I had been using Nova Launcher and was pretty happy with it, but the allure of being able to talk to my phone whenever I wanted to proved too great to resist.
Now, barely four months later, I'm back on Nova Launcher
again. You can get access to the latest beta by joining the appropriate Google+ community
; I myself am content with v 2.3, which hasn't been updated since last December.
What makes Nova Launcher so great? For me it's a single, standout feature which I hadn't realized how much I'd missed.