Fortunately things are not all negative with the Phantom Vision 2 +.
I have done a dozen flights by now. I have not experienced any flyaways. Twice I have lost wifi-connection, once at ca. 200 meters height, once at 150 meters height. Both times the Phantom has returned safely by itself and landed where it took off. I've had one crash due to some trees that weren't supposed to be there. Luckily it landed on its head on the ground (and not in the creek about two meters further on) and all that was broken was two propellerguards and my pride.
On one of my latest flights I reached a height of about 300 meters. I think the trick is to make sure the antenna on the radio is perpendicular to the radio itself and not pointing towards the Phantom. It's also recommended to point the radio upwards making sure the line between the wifi-extender and the Phantom is as straight as possible.
The gimball works perfectly giving almost unbelieavbly steady video shots, the batteres lasts for a long time and the machine is a pure joy to fly and handle. I use the NAZA-M mode by the way. In that way I have the Return To Home on the right switch and not only when the connection is lost or the radios batteries are depleted. Just make sure to choose Failsafe in the popup menu in the PT2 application and not Manual!
So all in all I am a very happy Phantom Vision 2 + owner so far.