Came back from Verizon store with my $700 S4 yesterday. Coming from a Galaxy Nexus my first impression is that the phone is fast and much smoother than my Nexus. I thought 4.1 was supposed to fix this?
Anyway, I was surprised the phone comes with what appears to be some decent IEMs (at least for a pack in). I haven't opened them yet and may just keep it sealed for purposes of selling later when I upgrade from this phone.
Most of the advertised features are not activated by default. Eye scrolling for example, you have to enable this in the menu. It does appear gimmicky and simply using my finger is much faster and more responsive. An interesting thing, it's not really eye scrolling but the phone directs you to move your entire head down or up to scroll. Also, it only works with the stock browser from what I can tell; it doesn't work with Chrome (which the phone comes with preinstalled.)
Coming from the Nexus I expected the screen size difference to be more apparent. It isn't and as a result I'm actually eyeing the Note 3 and may upgrade to that once it's released. Hopefully I can get at least $500 for the S4.
Got this case from amazon and it does the trick perfectly. It's funny when you see cases at the Verizon Store or in Mall Kiosks that are the exact same thing but cost 4x the price.