I like Vignette but I've noticed that photos taken with the app seem a bit fuzzier than the stock app. I've taken several pics using both and the stock app just seem clearer.
Complete opposite with me. Every picture I've ever taken looks clearer than the stock and the colors look richer and closer to how it actually looks in person. Make sure you have a steady hand, you're on 8mp, and you focus the right way.