I'll start. One of the employees at company I worked wanted to go on vacation, and I was chosen to be his backup. So he showed be the ropes. That was in 1997, and it was a ULS laser. I don't remember the model. I do remember it was onr of the first ulslasers that had motorized up and down Z axis instead of a knob. Guess I was hooked as two years later I purchased my first uls laser.