It works... and using the 3 presets in Franzis Denoise Projects 2 Pro, the Strong setting in Easy Photo Denoise is somewhere between the Franzis app's Balanced & Soft presets. Easy Photo Denoise does not give you a P/Shop plug-in, nor does it have all the advanced settings in Franzis Denoise Projects 2 Pro, but then as a GOTD you also don't have the MSRP of $89 [$79 upgrade] posted on the Franzis site.
There aren't a lot of choices when it comes to photo denoise software, & AFAIK none that are anywhere close to magic bullet status. Ideally what looks like a solid color in an image still looks the same when you zoom in, using whatever software editor &/or viewer. Many [most?] digital images don't meet that simple test, though how badly they fail does vary. For a quick comparison you can save & check a sports photo online, which is often shot with something like a higher end Canon or Nikon camera [usually at lower ISOs], & the only noise you'll likely see is artifacts from the jpeg compression [ msn[.]com/en-us/sports/mlb/5-players-turning-heads-during-early-days-of-spring-training/ar-BBUustJ?ocid=spartandhp ]. To try & fix the noise in an image yourself, you'd have to blend the pixels so they're all the same, for each individual color & level of lightness/darkness, which is a daunting task. For software to fix it is even harder, because while you can see where one object ends & the background begins, not coloring outside the lines so-to-speak, software cannot. And if you blend everything, those object edges can get pretty fuzzy. So ignoring all the hype, & advertising images showing near miracles, the results of using denoising software tend to be a bit subtle. Just remember to zoom in to check before & after.
Whether it's worth it or not to use denoising software is entirely up to you. Its necessary evil is that it's a trade-off between sharp & less noise. That's why in cameras that have built-in noise reduction it's often at a lower setting or off by default. Want to do away with noise near entirely? Get a better camera, &/or if you're shooting at higher ISO settings, don't, though using an ISO of 200 is not ever going to be a cure for a camera that shoots noisy pictures. Or just do like most people and ignore the noise. ;)
Easy Photo Denoise itself is a ~46MB file, with only the one program folder. New registry entries are a HCKU\Software\softorbits\EasyPhotoDenoise\ key plus a key for uninstall. After installing [& monitoring the install] in a win7 32 bit VM I exported that EasyPhotoDenoise key, copied the programs folder to my regular win10 install, merged that key, & fired up the app to confirm it was working.