They work well and shouldn't be noisy. I have used several of them from 30-100 dollars and didn't have any noise issues with them. They work better for target shooting like 3-D and longer distance stuff since you can get more range out of them than a regular 3 or 4 pin sight.

The down fall is they are only one pin and you really don't have time to adjust them when hunting. So you better be able to hold over and judge your yardarge well, or be ok with limited range. I feel if you want to shoot over 25 yards a multiple pin sight is much more simple. There is also the issue with having the sight set to the wrong distance and missing your target. I have done it a few times while target shooting. I will be shooting at 60 or 70 yards and then shoot again later at 20. The problem is I forgot to check the sight to see where it was set and shot about 4 feet over my target[].

I solved the issue by using a 3 pin sight on a movable sight frame. Now I zero the frame at 20 yards and can shoot 20,30 and 40 without moving it. when I want to shoot farther I can adjust the sight.

Paul