Its cool, but unuseful if you already has LR or similar.

This App does only one thing that LR doesnt do — looking for similar pictures for delete duplicates. If you have LightRoom you can do the same by manually (if you are not blind of course).
All other features LR has as well, like Pick Up or Reject, and more.

If you think the App can choose the best pictures among duplicates for you — youre wrong, it cant. If so, no any difference which App youre going to use for this.

I give 5 star only for the main feature )

Shoroh about Snapselect: Amazing Photo Duplicates Finder and Duplicate Cleaner., v1.1.1