I am converting my armor from a velcro and strap system to an elastic and snap setup, and it is about 75% finished. I am so impressed with the Dritz snaps and feel very confident that they will be more than durable for trooping, etc.
As for the plastic squares used to affix the snaps to the armor, I took some advice here and simply sacrificed a couple white, Rubbermaid trash cans from Home Depot (they were $3.00 each). It works very well.