Try this test. Get a couple of 24" stiff leaders. Get two identical 1-2 oz round ball weights and tie one on each. Then tie on a Sampo ball bearing swivel on one and a look alike ball bearing swivel on the other ends of the leaders. Now give them a spin by the ball. No comparison. The Sampo will spin for minutes while the other one will stop very quickly. Replace the cheapie with your other favorite swivel and spin again. I bet the Sampo out spins everything by 25-1. You will be amazed. I even look for the commercial version of the flashers with the Sampos on each end for putting spoons on them. When a flasher is shot I cut the Sampo off before throwing it away and keep it for other uses.