I'm not sure if this has been discussed yet as I could not find anything searching. This weekend I had a small crash that broke one of my DJI props on my Phantom 2. A few weeks back I purchased these http://www.ebay.com/itm/291058659443?ss ... 1497.l2649 which are the same ones I believe found all over the place. It's been getting harder to find DJI props so I thought I'd try these. I installed the one prop on the rear and turned on the P2 and waited for the LED's to blink green. Once the GPS was ready to go I began flying. I was just practicing that day and was doing low level maneuvers and spent most of my time in ATTI mode. The P2 was flying but something just didn't seem right. I did a full throttle climb and the P2 climbed but was drifting to the right rear which just happened to be the same corner as the prop I replaced. I did it a few more times with the same result. At that time I decided to replace all the props with the aftermarket ones and see how it would fly. After GPS was acquired I took off in GPS mode. The P2 was almost impossible to fly. It would not maintain altitude and kept falling straight down. Any maneuver resulted in slow reaction and it would not stabilize. From my experience with these aftermarket props I would suggest you stay clear of them. They do not work on the Phantom 2 as advertized. Below are some side by side photos of the DJI prop and the prop marked O-XOXO. You can see that these props look identical in every way. They have the same markings other than the DJI and O-XOXO. Notice the more rounded corner of the DJI prop.