I have zero experience with that knife. In fact that link is the first time I can recall seeing one. Something definitely seems off if it's dulling that quickly. Any halfway decent blade should be able to get through more than just a few fish without dulling like that.
When I decked I use these blades exclusively. I'd say 75-80 percent of all deckhands here use them today. My deckhand cuts 50-60 bottomfish per trip with his, only taking a few swipes on a hone every 10 fish or so. I used to keep two of them onboard, one for rockfish and one for lings. I'd never touch em up on the water, just put them on the Worksharp after every other trip.
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Like most things fillet knives are a lot of personal preference of course, but the Dexter "Woody" is king as far as I'm concerned. I own probably 50 fillet knives if not more. Just kinda like them I guess, but Woody is the only blade I actually use for any fish except tuna.