I am Portuguese photography professor - 37 years making photography - and the sofware of choice I always advice to my pupils is PDN, as I also work with PDN and with Capture NX, and because I find PDN simple enough and powerful for photography purposes.
However one thing I really miss is the ability to have always the image "live" histogram as a "window" - as "history" and "layers" - which would change after any adjustments we make, either on levels or on curves. I know that Curves+ do have a "live" histogram, as well as on "levels", but I really miss one histogram as a side window.
Is this feature being previewed for future releases of PDN ?