I bought a bow for a dealer once and he INSISTED I use the tubeless peep sight. I kept telling him "I have no problem with the old rubber tube sight". Long story short, my zebra string continued to stretch, needing constant twisting. I finally went back to my old reliable rubber tube peep sight. I have never regretted it. When you draw your bow back....the peep is right where it needs to be. Replace the rubber tubing every year or so and you are good to go.