I demoed the Redefiner last Spring, when it first came out. Loved it the first day out. Called the dealer and told him to put it on my account because, he is not getting it back. After 2 weeks of using it the aluminum gaurd broke off. It was covered under warrenty. I told the dealer that I think the guard should be made out of something other than aluminum. When a rock gets stuck it puts pressure against that guard and will crack easily. Well, this Spring I purchased a 2nd one (they do work great). In one week one of the shields broke again. Replaced it under warranty. Now, 1 week later the men tell me that the 2nd one has a crack in it already. Has anyone else been having problems??