High-quality system blades are always a "yes, but ..." thing. Unfortunately.
So you get an extremely cheap so Mach3 including beginners blade thrown at (yes, here and there free of charge with us, there was formerly common in the so-called Unitüten) buy more, and then you have blades sometime course. Every now and then there is then a really good deal, any advertising packs or just simply smart deal. But almost always going to remain quite expensive replacement blades in his hand at the supermarket shelves are not astonished badly, what can cost something.
Okay ... but quality costs stop, right?
Somehow yes, because the Mach3 blades hold if cared for quite a while, bring Wore a clean shave and are also really practical in use. The Sensi-Strip fulfilled its task with flying colors and I think that keeps even a bit longer than the previous care means trips to the Mach3 blades.
Adding up to cost more but last longer than cheap blades, cost more but shave better than cheap blades, cost more but are simply better than cheap blades. And if you make up these costs nothing, the choice should fall correspondingly easy.