Have had this great product for 2 months now. Had only 1 crash, which was its first flight (2 months ago) with no extreme damage other than a few scratches on the body and not a single crash since then. The lower left motor sounds really agressive when pushing the left stick right, but when i push the left stick left, it sounds smoothly. I would also like to add that I have no experience with QC's until I bought this. Watch the video below and tell me what you think. I'm quite worried and being a responsible pilot, I wouldn't risk flying with an abnormal motor (If ever). Any replies/suggestions would be greatly appreciated.