Charging power is acceptable, though it could be a little faster. The 15w samsung wirelesd charging stand (ep-5200) is not convertible, but can charge latest samsung phones ~30% faster. It's fast charging my samsung 21 ultra at quick charge speeds.

This charger is perfect. It acts as a stand too. Highly recommend. But read the directions on how to put on the back kick stand.

I bought the samsung galaxy s21 ultra, it's a top notch phone. Would not charge. There is no way that much heat will not eventually ruin the battery and probably the phone too. It is very expensive with other similar wireless charging products.