I have fallen in love with this plugin. A while back I posted about RE:Vision Deflicker, and how it can be used to pull noise out of rendered imagery. While that is a good tool, not only is this tool faster and more efficient, it's about a quarter of the price.
This isn't just a might-get-away-with-it smoke and mirrors trick either, it works consistently well for removing that pesky high frequency noise that is extremely expensive to remove in 3D, and does so frequently artifact free, with very little work. It is better than any 3D denoiser I have seen in off-the-shelf renderers. It supports all the major compositing applications, and its' function is identical between them.
High end studios are using this software on virtually every shot - it's that good. Get on it.