The sharpness is the first one, the rattling is many and it is not suitable for the detailed work. Regarding sharpness, it is okay if you sharpen it, so there is no problem but I am considering a countermeasure for rattling. I thought that it is easy to use because it is possible to adjust the length of the blade and to be easy to grasp.
We are using electric knife type, so we can use only knife like this as a cutter knife to store the blade, so we use it. I hope the sense of in and out of the blades and the fixation condition are a bit more firm like a general cutter knife. If other goods are available in other companies (other companies etc.) please introduce.