That's a really nice, super-clean kit, but I see a couple of concerns (in addition to the $250 pricing).
How would the IOC switch operation play with things like resetting home point. Since resetting home requires a 5x IOC toggle, then it seems like the retracts would deploy when trying to reset home?
Also, it doesn't appear (at least from anything mentioned there), that there's any failsafe operation. If the gear is up when you lose a control link, or hit critical power levels outside of visual range, and the phantom is forced to land, you could very well auto-land on your camera.
The micro servos being used are going to be very low torque. Even in the video I could see the deployed legs moving with what appears to be very little force (under power). Are these things going to be stable enough to land on? The stock DJI leg design is an unstable one to begin with.
All that being said, I'm probably going to order this anyway