ordered one because it looked like it would work and they get good press,well upon inspection the thing looks like it's been cut out with an oxy-acetylene torch by a shop class student! even the teeth had big burrs on them from the cutting process.called dirt tricks(the co. that makes them)they were cordial and sent out a pick-up and sent a new one,we'll see what the next one looks like. is this normal and they just wear in with the chain(i'm guessing chrome moly is softer than the carbon steel chain rollers?)or will this cause premature chain failure? anyone use these?