Of the 3 sites I have, the Cobra 3 pin I have uses the TKO pins is my favorite and extremely brite.

I added 2 pins to it.
My bottom pin is 70 yards out. My top pin is at 20, with aluminum arrows. With carbon arrows my bottom pin is farther then I want to shoot.

I like to see how far away I can get and still hit my mark.
I can see just which direction needs fine tuning on my site, the farther from the target I get.