This is by far the best Olfa knife. The knives that use the wheel locking system for the blade are awful. If you happen to keep the knife on your person in a pocket or holster, the wheel has a tendency to spiral itself loose, causing the mechanism to release the wheel and blade. This slide lock does not suffer that problem. I have used these knives for years and only seen the frame break once after steady abuse. The pick on the end is quite useful at doubling as a scraper, flat head screw driver or many other applications.