I tried to cut a block of mozzarella (not too soft really) and this product just didn't work well at all. If you set the slicer down flush with your cutting board you'll notice the problem immediately. The wire doesn't actually touch the cutting board, but floats above it just a little because the roller has a greater height. So basically when you go down vertically on your cheese block, at the end you'll have to kind of finesse it through to make an entire cut. This is a big problem with softer cheeses because the downward pressure you apply creates a bubble of sorts towards the bottom which gets caught up in the roller. I'm going to tryFox Run Marble Cheese Slicerand see how that works.