I have been having a rapala electric knife for 3 years and havent had to buy new blades. They are still as sharp as the day I bought it. I bought it after I went thru a couple of mister twisters. I have bad luck with the twisters. Stripped the gears on one and burned another one up. They are not the same knife as they were back in the 90's. I had 2 twisters I used in my restaurant that cleaned 1000's of fish and never gave me a problem. But the new ones cant make it thru a few limits of red fish.