I'm starting a major refurb job on a Gottlieb Central Park. The last/first EM refurb I did (KoD), I went with traditional rubber. However after helping my son w/ a school science project comparing elasticity of pinball bands for rubber, silicone and polyurethane, we noticed the Titan silicone bands performed more like rubber than poly as far as a natural bounce from a sling; at least from our test apparatus. But... proof is in the pudding. Has anyone used Titan's silicone bands on an EM machine? If so, do you like them better/worse than rubber for EM? My gut feeling from the testing we did is to go ahead with the Titan silicone bands to gain longevity but retain similar elastic characteristics. I sorta ruled out poly bands as I was a little worried that they would be a bit too tight and the coils couldn't fire strong enough against them. Thoughts?