I think the pillow looks a little gimmicky to me, the plate is nice but you have to be looking down at it to see the phone properly. Thats where the stand excels because it doesn't take much if any extra space than the plate does but it allows you to use and see your phone while its charging more easily.
Also I think you can get a free plate even if you bought it at a MS store, I could be wrong though, the website is:
http://nokiafreecharger.com/pages/holding