I "inherited" one of the 1.0 gen models from my step father. He ruined every blade in the house with it. I was able to get most at least usable except for a couple of Victorinox kitchen knives which I just ordered replacements for after finding a place that sells them individually. I spent hours with the Lansky deluxe set getting them to cut more than butter and the points are just gone hence the replacements.
The trick seems to be letting off the switch at the point and not pulling the point through. It's easy to say and comprehend but I'm nowhere near astute enough with it to use it on my knives. It's killer on lawn mower blades and axe like things though!