I use them! Their way better than the normal blades!
A lot sharper, and last a lot longer! Just cut at low speeds,
1 to 3 and they last very long!
Couple of months ago, i was at my local hardware store,
and a Fein rep was there. So i asked him about the
normal blades and why they wear out so fast, specially when
hitting a nail or so. So he gave me one of the long life and told me,
try this! I was amazed an bought a whole 50 pack a couple days later.
Just try one, you'll see!
Rick