We have more expensive Samsung phones that charge wirelessly and this adds wireless charging to our cheaper phones.
It works seamlessly, you just put your phone on the charger and it charges just like pour more expensive phones.
The only downside I can see is that it takes over your USB port so that if you need to use the port you have to unplug this item.
It's not an issue for us because we charge the phone overnight and we don't need to charge it again until the next night.
In addition we don't need to use the USB port for connectivity because our phones connect to our PC etc. Wirelessly to transfer data and photos.