DoubleExp review update

I recently reviewed DoubleExp, and commented on how the 3 effects did not appear to show any visible differences when applied to my test photo's. It turns out that I had been processing these effects incorrectly, as unlike other apps you have to select the filter/effect first, and then open the 2 photos that you want to apply the filter too.

As the photo's below show, the 3 filters/effects "Half Mix", "Screen" and "Overlay" do work....

....however my comment about the usefulness of this app still stands.