I installed it and when it auto-launched sys prefs it crashed. I launched sys prefs manually and looked at the prefpane. Looks like a decent set of options, but when I want configuration of my screen capturing I'll use Screen Snapz Pro - with that I can configure it during the capture instead of having to go to the prefpane to toggle options.

Additionally, apparently AlphaCapture injects some code into the Finder. When I tried to trash it, it insisted that AlphaCapture was still in use despite me quitting the daemon. I force-trashed it (Secure Empty Trash) and the Finder crashed with a dyld error, making me think that AlphaCapture injected code into the Finder and that's why I couldn't throw it away. This makes me very uneasy, especially since I was not warned that it was doing this.