I'm very pleased with my s8+ , only thing/s I'm not happy with and that's the contacts , calling, messaging screens . The text is faint and it can't be changed either in colour or font. The text and Viber etc screens are identical so I've changed the background on the one but that still leaves a lacklustre font and display.
Whereas on my s5 I could dial from one screen , the s8 has added extra screens and taps , all it's done is make it more complex.

Do not use their merge duplicate contacts feature unless you want to spend a few days calling the wrong people and picking through thousands of contacts trying to sort out the mess