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My dad, an electrician, asked for a new wire stripper for Christmas. So I made him this.(r/pics)
As an electrician, I do not recommend auto strippers. They have their place, but wiring buildings is not one of them. A nice Klein or Ideal stripper is about $20 and in the hands of a halfway decent electrician is much faster, more accurate, weighs less,uses less force per operation since you aren’t dealing with the springs, is more versatile, and dings up the wire less. I use these; they have nice ergos which seem to reduce wrist and forearm soreness, especially when you are trimming out all day.