I have one of those for my S8+. It's nominally better in terms of positioning tolerance than the old Qi charger I had for my Droid, but not by much. I still have to have the phone within a couple of millimeters of the left-right sweet spot for it to work. I'm glad I have the charger, but it's still pretty fiddly. Maybe it has a wider range if you don't use a case, so that the back of the phone is closer to the mat. Aside to those considering: it charges noticeably slower than the straight plug fast charge, but still faster than the old, non fast charge systems.