That actually looks pretty decent for a cheaper tool.
How well do the tool locks work? They LOOK quite functional.
The long blade is at least the right SHAPE for filleting. But I'll be honest, I'm no expert on preparing fish. The handle might be in the way, the blade might not flex enough. I know people who do a lot of fishing can get REALLY picky about their blades.
I guess the hex bit holder is just to make the tool generally more useful, like the can/bottle opener.
Could I ask you to take a picture of that unknown tool closer up and from a different angle? I can't figure it out either.
All things considered, though, it looks pretty awesome. What did you pay for it?