My son has been playing a Couf 4*S (advised by chitownjazz-Thanks!) that he really loves but it tends to squeak now and then. He would sometimes swap it out for his metal Tone Master Link 5* that never squeaks. He's been playing a Couf opened to .075 by EZ and absolutely loving it. He says it's much easier to play and it never squeaks! EZ is a hero in our house!