I've used a couple of electrics. You just plug them in, put some chips in the pan, and let it smoke. My dad had one which smoked too hot, would burn the chips up too fast, and tended to cook whatever was on the lower levels near the burner instead of smoking it dry.
He got a heavy duty dimmer switch and wired it in there, making the burner output adjustable. That was a great smoker after the modification!