I've spent this week playing around with the Galaxy S6 -- it was used on a secondary line, but treated as a main device. Thankfully I have no friends and hate everyone so the few people I communicate with daily didn't mind dealing with the various numbers I had been contacting them from.
I think Samsung has finally created something both beautiful and functional; this is the first Android handset that I have used that actually allowed me to forget where I had placed my iPhone. I swapped out the launcher for Google's own, as well as the Google Keyboard, but outside of those two nuances, I'd say the handset is a hit.
I don't mean that solely for Samsung, there's a huge emphasis on that for Android itself. In the past I've always deemed it unusable -- I've always had a love hate relationship, but unfortunately it's always been more hate than love. It used to be very lethargic when trying to navigate, typing was slow and inaccurate, and it never had much going for it in regards to design language.
Samsung's new processor is a performer and after I had disabled haptic feedback for the keyboard any if the quirks I had with lag were eliminated for the most part. iOS still has an advantage here that's noticeable to me, primarily because it has been my main platform for 7 years. You notice that slight snappier performance in daily usage when coming directly from it. But I feel if you're a current Android user, or spend a month away from your iPhone, it would go unnoticed.
Battery life wasn't as good as my iPhone 6, but it also wasn't bad. I must note a disclaimer though, my daily driver has wireless charging built in -- whenever I get in the car I drop my phone on the pad and it automatically begins charging as music plays via bluetooth. (This was my favorite feature.)
With that being said, outside of my frequent top ups, I don't think I'd have an issue making it through a full day with my standard usage.
One of the greatest features is the camera -- I was surprised at how well it performed compared to the iPhone 6, it definitely blows it out of the water. It's a fair match to throw it in the ring with the 6 Plus, but the 6 is really no competition for it. This shocked me, I knew that the 6 Plus had a better performing lens but didn't know there was that great of a gap between it and the 6.
I found myself continually reaching for my S6 when I wanted to take a photo and forgetting my iPhone 6 even existed during my time with the handset.
I tried to give the Edge a chance but it wasn't for me -- it was too awkward trying to swipe across the display with the edges, the standard format is what I'm acclimated to therefore anything else I wasn't interested in readjusting to.
I really want to switch from my iPhone 6 and I still may, I'm torn. My primary issue is the fact that I actually pay for media, therefore iTunes has everything I own between music, movies, and tv shows. I do my reading from a Kindle so that's the one that is irrelevant and compatible on both platforms if I choose to do so from my phone. I just don't know if I'm ready to make the switch out of the ecosystem since it's what I'm comfortable with.
My old gripe used to be iMessage, or the more aesthetically pleasing nature of the platform. Today that doesn't seem to hold as much merit as it once did. The S6 is a great device that I'd have no problem recommending to someone looking for something new. iOS has become monotonous and buggy to me, so I see it as tit for tat between the two, given both have their own quirks to battle through.
The reason I use the iPhone 6 in comparison is due to the size, the S6 is almost identical in size with a larger and more impressive display. I also deem it the best comparison for the common consumer, because they are the two best selling handsets in their market segment.
If you're in the market for a new phone, definitely put the S6 high on your list as a solid contender.
Update: display on my S6 has already been scratched from carrying my iPhone 6 in same pocket, for a week. Makes me question the durability of it in everyday usage for months on end.