I am coming from a Galaxy Nexus and there are many items I really liked on that phone and many non "intuitive" things on the S4. As mentioned everywhere – too many gimmicks, but all in all its much faster and a better experience than the Nexus. Screen and Camera are much better etc..
The main issue I have run into was that of the Wi-Fi Issue that is plaguing many. Sadly I have the main router that is a problem with the phone, but with some tweaks it is now working. Those tweaks technically diminished my routers wireless security but for the moment its fixed and hopefully someone will get that fixed with firmware in the future.
Just big enough to almost allow me to dump my other devices.. well I will put it this way at least for me its much easier to have one centralized device, vs a nexus 7, nexus 10 and a phone to lug around. But there are still some things you need the larger screen for.. I am a pinball junkie and this is easily the best app for it:
But the larger screen on lets say a Nexus 10 just makes that experience more fun.
It is an interesting time we live in that all this tech is battling it out for our attention..
I think I would still just like to have a wearable computer that could be more a part of me than a phone seems to be able to be.
What do you think?