Lovely bit of kit, looks nice. I tested it myself with thin ropes and thicker ropes. All top roping. It works well inc. the thicker ropes .
Websites selling the product say differing sizes of dia. to use but the product instructions that come with it say 8.9mm to 12mm. First looks makes you think that thicker ropes will be hard to take in but nope, smooth operation.
It's stainless steel rather than the usual alu. alloy so harder wearing. At first it looks like it only works one way as there is less fillet on one side but again instructions say both sides low/high friction.
My kids group use the clog flyer 2 devices which can lock up on taking in, they try to take in too tight. It's very small and discrete and the plastic coating stops the jangly noise.
So apart from paying out a leader I have tested it and bought another 3 !
PS A lot of newer device inc. grigri 2, only work with a limited range of diameters of ropes, so at a wall you come across a wide range inc. the furry variety.
I find it sticks occasionally when taking in, no matter which way around I use it. I've yet to find a single rope device that's better than my BD ATC Sport.
