Good looking phone, feels premium, good camera, good display BUT has some drawbacks: finger prints magnet, ultra bad memory management: it has 3GB of RAM and yet extremely poor multitasking - the apps and chrome tabs keep reloading. Hope that is fixable with an update..
The battery life is pretty bad too.
Also you have to get used with the phone because of the curved display and the thin aluminium frame (it's hard to use it one-handed, you can easily touch accidentally the display).
Beside those issues, cool phone and TouchWizz really improved in terms of design.. and thanks to Themes system you can get a closer stock UI experience. TouchWiz adds some good aditions to Android as well: split view, popup view, proper USB2Go storage, and many little things that improve overall experience. But still prefer the Android's stock UI experience - it looks cleaner. Plus with Touchwiz you get lots of unwanted apps that runs in backround (it would be cool if you could actually disable what you don't need)