RE: string loop/ultra nock...pros/cons
There are no pro's to an UltraNock compared to a string loop. It's heavy so reduces speed by about 8fps or more. Wears out your release jaws. Noisy and can, depending on how it's installed, beat the hell out of your cables. There are 2-4 screws that can come loose letting you beat your face apart while drawing, not to mention something putting your eye out if one of those screws come out on the rebound. I consider them something added for someone who doesn't know any better.