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I used the Kong system for a few months but changed over to the WRD Spider cut out tool and I am much happier with it. Its faster and less bulky than the Kong. You do need a small brushless drill to work the spider but its better than hand cranking the Kong. I've used the Gorilla line, and it works ok. Its pretty thick though. I have used 100lb fishing line and that works in a pinch. The Spider Line that comes with the tool though is really strong and thin, which helps cut through urethane a bit easier.