Our new Gravely 160Z has 13 hours now and up untill yesterday has been cutting amazing. Well one of our higher end clients decided to mulch there own place this year which is fine but they left a huge rock in the middle of the DEEP THICK grass and I didnt see it in time. I pulverized and it mangled up the tips and rounded them off of 2 blades. I did my best to try to sharpen and fix them but they are to rounded off now and its not cutting nearly as good as it was. I am disappointed in my customer and in the fact that its now going to cost me $70 for 2 new OEM Gravely blades. We are going to let them know what THEY did and make it clear we are not happy about having to shell out $70 for new blades for a brand new mower. We are hoping they will offer up to split the difference at least.