So do any of these launchers neutralize any of the S5 features so you can't use them? If so which ones?
Hmm I kinda liked being able to just pick up my phone and say "Ok google".
I quite like that as well, and it's a shame Nova doesn't have access to it. However, it's not enough to get me to use the Touchwiz Launcher.
My workaround is to have a shortcut to Voice Search on my home screen. Also, long pressing the home key brings up Google Now, and then you can say OK Google.
It does, but I'd lose my 5 X 6 grid and swipe up functionality. It's not worth it when I can have a shortcut on my desktop.Which is why I will probably try out the Google Now Launcher because I believe that function still works.