I have had two Mr Twister knifes in the past 20 years and I love them. I do buy a new blade every 3-4 years or so. I do mostly pan fish cleaning and once you get the hang of it, they are great. When I do clean a larger fish, I am glad I have that extra power. I have thought about a battery model, but then I realized that I do 99% of my fish cleaning somewhere that I can plug in, so I just stay with what works.
When I do a canoe trip, I miss the electric and think about the battery models, but I don’t think for the small amount of fish I clean on a canoe trip (1-2 meals max) that the extra weight would be worth it.
PS- I was fishing on Sat and the guy I was with did NOT have an electric knife. We were cleaning 38 yellow bass and I was flying through my pile while he watched. He is not a rookie fish cleaner, but I was still out doing him 2-1. He stopped at Fleet Farm on the way home after cleaning and bought a Mr Twister.