I have checked them out and I personally think they are not worth it (for me).
First off..you have to buy the accessory case to put on your phone so it absorbs the charge from they matt...which aren't exactly cheap..
It depends on how many devices you or you and your family carry. Having a central charging point in your home that powers all your devices makes sense......no more searching for the correct cord. But keep in mind that the cases add weight, bulk and price to your devices. So for day to day use, it’s somewhat of a trade off.
For travel, there are two things to consider. First, there’s outlet availability. You should literally weigh the wireless charger versus the power cables. I would rather carry a box adapter with multiple types of ports.
It just depends on your situation...and...the matt..does technically provide wireless charging but the mat itself needs to be plugged in.
I just don't think it's worth it to add the extra bulk to my device just so I can set it down on mat to charge it.