The tool changes the blade is as simple as possible. The locking pull down, stuck the blade into the receptacle and push it down - that's it. The blades are not stored permanently but can still be rotated. This saves just in drilling the very exact angularity to workpiece.
Mittlweile I worked various materials so that, among other things, steel, stainless steel (V2A), plastics and many more. and have never been disappointed. Each blade has its purpose and so far no signs of fatigue become apparent. The handle fits comfortably in the hand and is relatively easy.