It always makes me feel good to get a drain open when others have all but given up. Today the K-60 showed a Cobra and a Spartan 300 just how to handle roots. I heard it all from the other guy (a plumber I work with on a regular basis). "If I would've had my K-7500 I would've had that drain open a long time ago. If only I had the room on my van." He will soon be purchasing a K-60.