Just to see what would happen, I downloaded the Lightroom version. Since I already had a different external editor, I had to point to Perfectly Clear.\
I then tried it on a D800 image that I had previously edited in lightroom. The main subject was clear, but it did brighten up a purple object. Unfortunately, the shadow became purple too. Then, I tried saving it and got a out of memory message. OK, I only have 8GB, but it must use a lot of memory.
I tried a image next from my New G1X that had been edited. I did not like the result, the background was too dark. The lightroom one button auto exposure looked better. So, I tried to improve on that, and it did produce a improvement in highlights of a snow scene when based on the LR adjust as a starting point.
Finally, I tried a extreme low light image taken with my 5D MK III at ISO 56200. It was lit by incandesent light and whites were a golden beige color. The whites turned to blue green which was ugly. I could adjust the slider, of course, but it did not correct the tint nearly as well as I could in Lightroom. The NR was extremely heavy, and much of the fine detail was lost. Even pullinng the sliders all the way down did not help that much, I had to uncheck the NR slider. With lightroom, I had finer control of the noise so that I kept the fine detail while reducting the noise. I also could use the brush in LR to selectively apply NR which worked much better.
After trying it, I think that DXO does a better job of guessing the corrections to apply, but I much preferred my edits in LR most of the time.
For a $200 price tag, it seemed badly overpriced, $39.95 might be more reasonable, but I'd probably skip it for that price as well.
Still, someone who did not feel comfortable with using the LR sliders might do OK with it, but might also be frustrated with the tint controls and excessive NR.