Again, thanks for the lead: I did the search within this site and indeed it has been discussed and reviewed extensively. Now I will finish my research in Hedgehog and then probably buy!
I am using it and the only downsides so far are that there is no book or dedicated set of tutorials for Affinity Photo and that you have no cataloging set up like you have in Lightroom. It will save the .afphoto finished file to the folder that the original is in if you have the original file in your camera file i.e. Nikon Transfer 2/view nx2