I have three 45 and one 28. I like my Olfa best because when I release the handle the blade retracts. I like the Fiskars but I have to remember to close the blade every time I make a cut. I have a Kai that I got from my sister when she stopped sewing, I have not used that one much but I like that the blade comes down when pressure is applied and then retracts when released. I very seldom use the 28.