Well, I have three S7's in the household and I have three of the Choetech Fast Chargers (the one's at the link I gave) and all the Choetech fast chargers work great with the S7's. YES, like any other pad charger, including the Samsung, the phone has to placed in the "sweet spot" if you expect the phone to charge. YES, you have to have the proper adapter. As I said, I have used both the Samsung fast charger (more then one, actually 3) and the Choetech and to me the Choetech is the pick of the litter.