I have the Incipio PMA Charging Case for the 1520, and a Duracell Powermat (3 devices), and it works very well, once you get the feel for where to place it. It made connection and charged quickly in both horizontal and vertical positions. Once I got the hang of it, it became as easy as just putting it down on the plate. The case, of course, added bulk. But I was not entirely comfortable with the naked 1520. It had a certain slickness to it, and in some respects, I actually prefer the charging case. I should say that this is my first foray into wireless charging, so I have no emotional attachment to either PMA or Qi. So long as those electrical thingies get to where they need to go, I leave religion and politics out of it.
My principle issue with the PMA Case is that the added bulk put it outside the scope of my car mount, so I tried a universal mount that uses a very strong magnet to keep the phone in place, while allowing you to swivel the phone around. It required me to affix a metal about the size of a quarter to the back of the case, and the weight of the 1520 (with case) exceeded the adhesive strength of the metal ring. So I used Crazy Glue and it worked a treat. But I also wanted to attach the ring and the phone to as near to the 'center of gravity' or middle of the 1520 as possible. But the charging element on the PMA case occupies that spot. So I glued the metal ring right below the charging element and it has made the charging connection a little more dicey. My sense is that there's a sweet spot for this workaround, with the metal ring a little lower than right below the charging element. The magnetic strength of the car mount is sufficient that it would work as well there, and there would be less or no interference with the PMA charging element.
As a stand alone, the PMA charging setting was and is fine by my lights. I would prefer wireless charging on board, of course.