After chewing up a few blades with tip overs on bad take offs and landings, I decided to buy some prop guards. I bought a cheap set on ebay. They say Ttongr on them. On the maiden flight with these prop guards, I had some control issues and bumped into the side of a wooden building, then tumbled a few feet to a wooden deck. Two of the prop guards shattered into several pieces. (all 4 props were damaged, too) The next set I ordered cost me a bit more, but appear to be real DJI guards. The packaging was nicer, the parts look better, feel less brittle, and strike you as a better design. Sturdy yet flexible. If I had it to do over again, I would have bought the DJI guards in the beginning. They may not have protected the blades much better in a crash like this, but they couldn't have been any worse.