I got myself the discs on the advice of a friend, when I had to cut PVC sheets with corrugated profile. In contrast to the conventional cut-off wheels with 2.5 mm or more thickness to cut with this much less waste and provide faster (the disc affects 1 mm almost like a knife).
Also fine metalwork (shortened for screws or metal bars etc.) go very easily by hand. Of course, the wear is minimal.
Due to the nature I go however, assumes that the disks take a rough work ill.
