I agree. I said it was a gimmick when Samsung did it and I still think it's a gimmick. Instead of packing a small charger, you now have to pack, and lug around, a big pad? Not practical at all for travel. Takes up too much space at home. Total gimmick. Until we can have wireless charging that doesn't require your phone to sit on top of it, it's a gimmick.
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The only problem with that is finding a free wireless charging pad in airports, coffee shops, and other places. There's going to be dozens of people trying to charge their phones and no free pads.
As someone else said, with a cable it can charge while you are still using it.
I could see it being good for at work while listening to head phones. It always sucked that I couldn't charge my 7 Plus while listening with headphones.
Still, think it's a big gimmick and nothing more.