I have 5 drones all running naza and wokong flight controllers. I have built and flown many flights with little to no problems and know these things inside and out.My p2 had 8 charges when I installed the zenmuse and go pro. Fell out of the sky like a rock last 2 flights . After replacing all 4 props and taking off a mangled go pro and zenmuse, I took off again, no power on take off and was uncontrollable. Replaces all 4 motors with t motor anti gravitates ...didn't help. Sent to dji, after 3 weeks they said they flew it with no problems! Really? They upgraded the firmware and said they replaced the gps. They didn't show any details. Flew it today and doing the same thing before I shipped it. Shaking, pitching and yawning out of control. There is no way they flew it without problems. Now I'm getting a battery error in the assist soft ware that pops up for a second. I noticed that one of the cells is 12 mv less than the other 2 cells. Maybe that's the issue. I don't think it's gunna matter where you buy one of these,they are going to send you to dji. I have read many posts on the problems with dji service and units being shipped back to owners still messed up.
I'm giving DJI service another chance and they better not expect another dime from me for shipping. My local rc plane shop quit selling the PHantom 2 because of problems. I would love to here from someone here that has hundreds of flights on a P2 and have had no problems! Maybe that would regain my confidence in this thing. I'm sure I'm in for the long haul to get this thing flying so I can unload it. Better make sure my phone is charge up for the 1 1/2 hr wait on the phone for a service tech.