The Gillette Mach 3 blades have a clear advantage over the 5 blade systems. Hair is not stuck between the grooves. Many complain that Mach3 would not be as thorough as 5 blade systems. That's not true. The decisive factor is the preparation before shaving. One should thoroughly lather means badger hair brush. Then soak the brush in warm water and therefore go again over the foam over it. Then it works well with shaving stubble. Finally, apply aftershave and go over it again. Then you also have a perfect shave. A 5-pack is enough for me loose for a year, if you carefully handle the blades and this cleans extensively.