Nik is some great software. Well it was great 4 years ago but there is no longer any updates, so it may be a little out dated.
The good thing is since google bought it, it is now free. The bad thing is they've given up on it so no more updates.
Anyway, I usually only use the B&W conversion and the sharpening programs, I recently tried out the noise reduction program. It does OK but you give up some sharpness. I need some different eyes on it to help me decide if the give and take is worth it.
The fist shot is without the noise reduction and the second is with. Any input is appreciated.