I previously owned a S4 Active, then a S4. I've always liked the ease of use and how much detail Samsung has put into the phone features and the apps. I recently received my new S6 and I'm blown away with the sleek style, sharpness of the screen and overall functionality. There are some obvious changes since the S4 but it's surprisingly easy to follow the transition from the old to the new. I'm listening to the music right now and the sound/speakers are excellent. Love the new shaped ear buds, very comfortable, but only for a short while. My canals are small and it's hard to find a good fit that won't hurt after a while. Having a smaller option would be nice! I transferred my contacts, pics and some apps with Smart Switch which has worked very well so far. It hasn't completed loading all the apps from my S4 yet. Could be needing WiFi, which I don't have at home. So far I LOVE IT!
Pros: Realistic color, Bright display, Built-in speakers, beautiful graphic display, ease of use
The overall functions of the phone are good. The battery life is not good at all. I would recommend this phone to a light user. Otherwise, if your a heavy user this phone isn't for you.