I've not seen this type before, though I have used Maketar's vinyl masks for national markings (RAF, Luftwaffe) and have recently purchased a set of vinyl masks for a Spitfire Mk I, Mk V camoflauge. In each case, it was a sheet of paper with die cut masks on it. Really crisp and clean, and once you get the hang of using them (think RAF roundel or Luftwaffe balkencruz, and the fact that you have to mask of each color, it's tricky) they were quite nice, and I like the option of replacing a decal with paint. Though I've not used the camoflauge masks yet, they are all the RAF squiggly patterns on a sheet of vinyl that you peel away, lay down and paint over.
In either case, I'm told that with proper care, they are renewable, though I've not figured out what proper care is yet and in my experience after one use they never really tack down the same a second time.
Having looked at the link, it looks to me like you get the best of both worlds, the national markings and the splinter scheme in a mask. Whether that is vinyl or tape, I'm not sure. I've heard vinyl works better, leaving crisper edges. I've never really tried national markings with tape, so I cannot say.
I hope that helps, I know it was a little rambling and you probably knew most of it already, but that's been my experience thus far. I know I vastly prefer painting in a national marking, though biting into my tongue while I do it and hoping it works out nicely is a little downside, while in comparison decalling is much easier.