This summer, I've cleaned over 2,000 striped bass that have been caught in Lake Mead, so I do know a thing or two about electric fillet knives.
First of all, FORGET the Rapala, it is junk! I've got the 12 volt/110 combo like new in the case and if I could get $15 bucks for it, I'd sell it in a minute!
I've also got the Mr. Twiser, and the Wal-Mart special, American Angler (not made anymore), but the best one out there is the one put out by Storm.
I've cleaned a lot of fish with all of them, and as long as you don't let them get real hot, they will work great.
I rotate between the American Angler and the Storm now when I got more than 100 fish to do at a time. I've got 3 AA and about 5 new sets of blades for it. I like the ultra thin 7" model the best.
I rotate the knives so I don't burn them up anymore (traded Wal-Mart about 5 times before I figured it out you don't let them get hot!)
I think I'm getting this fillet stuff down.
I can do a striped bass 12 inches and under in 12 seconds. Over 12" but under 20" and they're done in 22 seconds!
God love those electric fillet knives!
Don Martin