As a watchmaker, I rely on the efficiency of my tools. I have used these screwdrivers each day, all day on ceased and rusted/chemically locked screws. These screwdrivers have stood the test of time, and are the envy of my entire shop. Aside from the price point (paid $8), these are hands down the best screwdrivers I've managed to get my hands on. This is inclusive of blued steel and titanium Swiss, American and Japanese manufactured blades.
Everyone should have 2 sets of these, if not more.