Nothing but the best Canyoneering Rappel Device!
I own many of these and will continue to buy them when they wear out or get lost when I loan them out to friends that I take canyoneering. I have found 1 downside about all ATC's. While 8's twist the rope, ATC's cause sheath slippage. That just means that the sheath will slowly slip out over the core and you will eventually have a sheath tail on the end and the core will be deep inside the sheath. This does not affect the performance, strength, or safety of the rope. It is just a slight inconvenience that can easily be fixed by cutting that end off with a hot knife and possibly taking a needle and thread to the ends of the rope and putting a bunch of thread through the ends so the sheath can't slip over the core.