I do get much more uniform cuts and soap sizes with my Bud Cutter, but as a beginner, to save money, the mitre box worked very nicely. The height and width of the soap, of course, would matter, which is why I bought the tallest painter's knife I could find. . The shorter ones would not have gone all the way through my soap log. The Norpro I had wasn't quite tall enough to get through some of my soap loaves. The other drawback was that the knife is so thin and the slots are made for a saw, so there was a bit of wiggle room with the knife, meaning potentially the soap cut won't be completely straight. Some are better at getting a straight cut than others. I'm not very good at it myself, but the price was right for a beginner.