The ability to change tips/heads on the tool seemed very useful and convenient to me. Well, if you only need this one tool instead of several.
Pros
21 BLADE INCLUDED. Total order 21 pcs blades. 11 pcs BS1010 Black HSS blades, suitable for wood, plastic and soft metals (such as copper, aluminum and silver). 5 pieces. BK3010 Black HSS blades suitable for holes (<1.5mm diameter) and clamp. 5 pieces. BS1018 HSS silver blades (with cobalt for strong cutting) suitable for stainless steel.