After some initial tip overs and problems that broke a few Yuneec blades, I bought aftermarket blades. I was getting a warbling video shortly thereafter. I went back to Yuneec blades and my warbling video issues seem to have vanished as quickly as they came about. I have only one flight under my belt since I bought the new blades, but so far so good. Take a look. I guess it does not save to go cheap on blades. Oh ... and I did balance them also.