I have downloaded the app and given it a try (this was after I deleted NXD).
Although I like the look and layout, so far, I don't understand why they did away with the ability to undock the palettes. With NXD, I had it set up so I had all the palettes open on a second monitor and only the work area on the main monitor. Now, it appears that is not possible.
Also, I tried the Retouch Brush to judge it's capability compared to PS. Not even close to the quality of PS. And, to make matters worse, when I tried to exit the brush and go back to the hand cursor, a second Histogram was generated, which now sits in the top right corner of the image window, right beside the paletted one. I can't get rid of the thing, even if I close and re-open the program. If anyone has a suggestion....
Marv