I, unfortunately, have two of the official Samsung wireless chargers and I am not a fan.
It looks pretty, but (1) it is hard to get the phone to charge, (2) has a super bright LED making it useless in the bedroom at night and (3) sometimes I pick up the phone to find it no longer fully charged.
To expand on the second point, my wife has literally banned it from our bedroom.
Instead, I have this one and I have nothing but good things to say about it. The RavPower is the same size as the S6, making it super easy to position, the LED is minimal but still helpful and it looks just as good. Big fan.
So I have this pad which works OK on this case but the positioning is a bit too 'exact' for me. I also got this dock which is much better. I've just ordered this one too for a different desk, which hopefully is going to be the best of the bunch.
They all work though, the dock is pretty cool just to be able to grab and go from the night stand.