The eye is small and there are many normal carabiners and maillons that will not fit through it. This is a fatal flaw, in my opinion. A tiny eye restricts versatility, and eliminates the option of using two carabiners for redundancy.

The eye has an annoying o-ring insert. In my mind, this is just a bad idea that won't go away.

• The o-ring keeps the from moving freely on the carabiner.
• It makes attaching and removing the more difficult.
• It catches in the notch in some of the carabiners that will fit.

Plan on dedicating a special carabiner if you want to use your .

Canyoneering descender designers and users may love o-ring eyes, but I hate them. O-ring eyes increase cost without providing a corresponding benefit. I see too many disadvantages to the small o-ring eye design and no advantages.

• Reducing the chance of dropping the device in one unlikely scenario by adding another item to drop doesn't count as an advantage, proper technique solves the dropping problem.
• I'm told that the tight o-ring guards against cross-loading and rollouts, but proper harness design and proper technique completely eliminate this concern.
• An o-ring eye may keep the orientation of the rappel device more stable when unloaded, which might help speed the process of coming off rope. The one place that I see this being relevant is if you're floating/treading in water over your head, but proper flotation is a much better and safer choice to address this concern.

You may disagree with me about o-ring eyes, I don't mind, but the undersize o-ring eye alone is sufficient for me to eliminate the from serious consideration.