Nothing Special
This app does exactly what it says. I have been using KitCam for a while and it does the same thing in low light. Both Apps limit the picture to 1 second max. The only thing that NightCap offers is to take multiple pictures instead of hitting the "trigger", which can cause motion blur in the slower settings.
I did not have any glitches running on my iPhone 5.
In summary - if your camera app already has a low light setting, you probably wont find NightCap useful. If you are using the stock camera and want better results in low light settings then this is a good app for you.
A, L, B, about
NightCap