I clean lots of fish at our camp, the electric is used for Pike as cutting bones wears out blades. I use electric as the battery ones do not have enough juice to continually clean, and yes the cord is a pain, but better then a slow knife.
What I do is cut meat off with electric, then de-bone with regular fillet knife. I had a Storm that died after 5 years and maybe 2000 fish cleaned, Pike and Walleye. I only wish the blades were interchangeable from different makers, but such is life.
I now have a Berkely as I could not find another Storm that was about $20, Berkely was $40, hope it lasts, time will tell. Good Luck