I purchased the exact spray can for the same reason, 7thCavScout. It does work quite well. I'm no experienced modeler, so I'm not real sure what a correct matte finish should look like. However, I tried it on a Zero that I had already screwed up. I had tried to wipe away a wash on the wings with laquer thinner and messed up the underpaint, even though it had been coated with Future. But that's another story. Anyway, I decided to go ahead and see how the spray can matte finish would look. Everywhere but the wings looked great. In fact, I couldn't tell the difference between the decals and the paint. I don't know if it's supposed to be like that or not. I guess if you do things right the decals should look that good, but from my standpoint, I was impressed. On the other hand, the wings where I had eaten through the Future coat already with laquer thinner really messed up with the matte finish. It crinkled up badly.
So, to make a long story short, the spray can matte finish worked, as long as you have a coat of Future.
P.S. - Another of my many mistakes was to unmask the canope before applying the matte finish. I have a real nice frosted glass canope to go with my paint crinkled wings. :)