Why do we pay more for one lens vs. another? One big reason is that the higher-quality lens lets in more light. When available light is an issue, using a better lens often lets us take photos that we otherwise wouldn't be able to get. It's the same way with noise reduction. You'd normally get ugly image noise by using a fast shutter speed in low light, but Topaz DeNoise can make you feel like there was never any noise at all. It's almost like having a photographic superpower. Like a $1,600 lens, DeNoise doesn't just make your photos look better... it allows you to get shots you otherwise would miss.
Technology with a single goal: less noise and more detail
Most noise reduction tools try to do dozens of different things. Not Topaz DeNoise. It focuses on doing just one thing well: removing noise while keeping detail. If you've used other noise reduction before, you'll be stunned by the image quality you get with DeNoise. It'll remind you of the difference between a DSLR and a phone camera.
Note: Now requires OS X 10.9 or later
Note: Although Finder indicates that this has no version number, the developer refers to it as version 6.0.2.