What is the most problematic in wireless charging? In order to use this feature you have to have both: a smartphone and a charger which support this technology. Also only high-ended phones support this feature. Would you like to have wireless charging feature in your old smartphone? Soon, it will be possible.
Very interesting project (i.e. kick-starter) called Gecko is present on Indiegogo portal. To be honest this is not the true wireless charging module, but small magnetic adapter which will transform e.g. your power bank into wireless-style charging station.
What is the most advantage of this device? It is really cheap and universal solution! You can also see how it will work in the practice.