Surprisingly Good!
At $1, I definitely suggest trying this app.
I recently tried to remove the noise from an image using Noiseless (by Macphun), photoshop, and Lightroom. Using Super Denoise on the same picture… I’m frankly amazed. Some detail is lost and for some reason the shirt collar got blured a lot. Aside from that, it gave me a result I was unable to acheive with Noiseless, Lightroom, or Photoshop.
I’ve only tested this app on one photo, but I have high hopes that I’ve finally found an app that can remove noise from a photo.
zellb about Super Denoising - Photo Noise Reduction