I have tested this tool for a week now and am quite satisfied. Combined with Shadowplay you have a free Fraps that has less impact on performance while recording with certain processes (i.e. image upload) automated and functionality for windowed non-game applications. The only flaw I found is that occasionally in fullscreen applications, the thumbnail popup of the picture you just took gets into the foreground, minimizing the game if you accidentally click it before it vanishes. In my opinion, the tool is quite useful and definitely recommendable anyway.
