Major disappointment. First it wouldn't set the 3/4" pins below the surface of the 1/4" maple scribe that I was attaching to 3/4 ply using 120 psi. No adjustment to set the depth deeper. In softer woods it would set the pin, but leave a big dimple from the un-padded shoe. After about 30 pins it quit working. The piston would not return to its upper position. Cleaned and lubed and it still wouldn't work. I'm shipping it back and am ordering the Senco. P.C. is catering to the hobbiest now days, not to the professional.