I got the S6 2 days before Christmas. I also have a Moto X Pure that I bought first of November. I love both of them for different reasons.
I have had none of the issues I've seen on the forum... WiFi is perfect, no screen issues, call quality great, etc. A little lag sometimes but nothing bad and nothing every smartphone doesn't have sometimes. Battery life is about equal to my Moto surprisingly. And man it charges even faster than the Moto, which also has quick charging.
I am enjoying the smaller size of the S6 for portability and it's what I have activated (on Verizon) right now. I don't have any regrets about it so far, it's been pretty awesome.
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