I have about 300 lbs, I paid $200. Either way I will make profit, but I would still like to strip it.

It's two different kinds. One is 1/2" with only a 16th" insulation that is to hard to strip with a knife or the drywall screw trick.
the other is 1/2" with 1/4" insulation. Softer insulation but way too thick to strip any other way.

As long as the machine pushes hard enough against the wire and the blade is sharp it should work, I would think...
Is there anything that you haven't been able to strip with it?