Bought this some time back online thru a fren
Tested it out on small fishes and it works pretty well. Both a small Bartail Flathead (which used the serrated edge) and a Javelin Grunter which used the normal edge.
Managed to turn these 2 fishes
I tried this tool on bigger fishes
And got them cleaned up pretty nicely.
As shown in their demo videos, it is just simply pushing against the scales and allowing them to gather easily onto the tool. The larger the scales, the easier and more convenient it is to gather into a bunch to throw away.
Really 2 thumbs up.
Videos in the site explain how it's used.
New update :
Angler's Outfitter does have this scaler in stock. Check with them.