I've been using this phone for a year now. The phone is still pretty, no scratch, not even tiny one despite of the fact that I always accidentally dropped it. Primary and front camera are great! Pictures are way too beautiful, friends always compliment it, always use my phone when we took group pictures or selfies, even in low light condition. Phone only lags several times, like once in 3 months. But after the marshmallow update, can only change font by buying it from Samsung Apps store. Battery won't last me a day but it's ok for me. I still love this phone! and it has a few scuffs and minor scratches but not had a problem with it. I do not use a case as it is georgeous. Every now and again I reboot it and get rid of any junk. I am using 128 version gold. It is in reality no different in use to any other Android just that it is stylish, gorgeous screen, audio I think is good thru 3.5 jack and speaker. Cam and video are reliable with good results. It is good phone and saw no reason to upgrade to S7 in fact I think S6 is tonnes more stylish. I was pleasantly surprised that the camera is even better than anticipated. In fact I did a side be side comparison with my DSLR. I went through a benchmark of photos in different conditions and closely inspected the images. The images were almost as good and some as good. I rarely use the DSLR anymore.
This phone is also super snappy fast. There is just something about it, that makes you feel good clicking away on it. Wish my laptop could be half as fast.And I will recommend marshmallow to every Samsung S6 user because Previously I had lollipop 5.1.1 version which hangs even though it has 3gb ram. After updating I found huge difference like fingerprint sensor works very fast. Better free ram. Less hanging problems. Please update only with the help of authorised Samsung service center. Because my friend encountered a problem while updating his phone.This phone is still very fast, reliable, no lag or freezes, excellent camera and display. Also durable with no scratches or dents and I don't even use a case for it and dropped it a lot of times ( never on concrete thankfully) . Battery life is acceptable with 4 hours on screen time and 48 hours standby. I love how it gets fully charged in 80 minutes.
This phone has cured me from my phone buying addiction.