A major con that i ran into was when my arrows got wet they caused a loud screech when i drew back
And as David stated.....they're noisy.
I think it's a great hunting rest for a LOT of people, though. And honestly.....if you're using the "right" arrow.....they're not even noisy. I was using Radial X-Weaves....and they were very noisy on the draw.
I switched to a full containment type drop away....and I've never looked back.
Good luck with your choice.