When I bought these blades I really had know idea which way to go as it was for my first reciprocating saw.  I thought for sure I would be going through several blades so weighted the reviews with the costs and decided to go with Lenox.  So, several heavy duty projects later (cutting through radiator pipes, walls, 2 x 4's, etc etc. ) I am still on the first blade!  I didn't even have to replace one yet and I bought a few. I rarely give 5 stars as there is always room for improvement but from what I remember this was also the lease expensive blade also.